485BPOS

As filed with the U.S. Securities and Exchange Commission on November 13, 2012

Securities Act File No. 002-58521

Investment Company Act File No. 811-02739

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933	x
Pre-Effective Amendment No.	¨
Post-Effective Amendment No. 45	x
and/or

REGISTRATION STATEMENT

UNDER
THE INVESTMENT COMPANY ACT OF 1940	x

Amendment No. 42

(Check appropriate box or boxes)

BlackRock Basic Value Fund, Inc.

(Exact Name of Registrant as Specified in Charter)

100 Bellevue Parkway

Wilmington, Delaware 19809

(Address of Principal Executive Office)

Registrant’s Telephone Number, including Area Code (800) 441-7762

John M. Perlowski

BlackRock Basic Value Fund, Inc.

55 East 52^nd Street, New York, New York 10055

(Name and Address of Agent for Service)

Copies to:

Counsel for the Fund: Margery K. Neale, Esq. Willkie Farr & Gallagher LLP 787 Seventh Avenue New York, New York 10019-6099 Benjamin Archibald, Esq. BlackRock Advisors, LLC 55 East 52^nd Street New York, New York 10055

Continuous

(Approximate Date of Proposed Offering)

It is proposed that this filing will become effective:

x immediately upon filing pursuant to paragraph (b)

¨ on (date) pursuant to paragraph (b)

¨ 60 days after filing pursuant to paragraph (a)(1)

¨ on (date) pursuant to paragraph (a)(1)

¨ 75 days after filing pursuant to paragraph (a)(2)

¨ on (date) pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box:

¨ This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

Title of Securities Being Registered: Shares of Common Stock, par value, $0.10 per share.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all the requirements for the effectiveness of this Registration Statement under Rule 485(b) under the Securities Act and it has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of New York, and the State of New York on November 13, 2012.

	BlackRock Basic Value Fund, Inc.
	(Registrant)
By:	/s/ JOHN M. PERLOWSKI
	(John M. Perlowski,
	President and Chief Executive Officer)

Pursuant to the requirements of the Securities Act of 1933, this Post-Effective Amendment to the Registration Statement has been signed below by the following persons in the capacities and on the dates indicated:

Signature	Title	Date
/s/ JOHN M. PERLOWSKI	President and Chief Executive Officer	November 13, 2012
John M. Perlowski	(Principal Executive Officer)
/s/ NEAL J. ANDREWS	Chief Financial Officer (Principal	November 13, 2012
Neal J. Andrews	Financial and Accounting Officer)
JAMES H. BODURTHA*	Director
(James H. Bodurtha)
BRUCE R. BOND*	Director
(Bruce R. Bond)
DONALD W. BURTON*	Director
(Donald W. Burton)
STUART E. EIZENSTAT*	Director
(Stuart E. Eizenstat)
KENNETH A. FROOT*	Director
(Kenneth A. Froot)
ROBERT M. HERNANDEZ*	Director
(Robert M. Hernandez)

	JOHN F. O’BRIEN*	Director
	(John F. O’Brien)
	ROBERTA COOPER RAMO*	Director
	(Roberta Cooper Ramo)
	DAVID H. WALSH*	Director
	(David H. Walsh)
	FRED G. WEISS*	Director
	(Fred G. Weiss)
	PAUL L. AUDET*	Director
	(Paul L. Audet)
	LAURENCE D. FINK*	Director
	(Laurence D. Fink)
	HENRY GABBAY*	Director
	(Henry Gabbay)
*By:	/s/ BENJAMIN ARCHIBALD		November 13, 2012
	Benjamin Archibald
	(Attorney-in-Fact)

EXHIBIT INDEX

Index No.	Description of Exhibit
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.CAL	XBRL Taxonomy Extension Calculation Linkbase
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE	XBRL Taxonomy Extension Presentation Linkbase

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	BLACKROCK BASIC VALUE FUND, INC.
Prospectus Date	rr_ProspectusDate	Oct. 26, 2012
BLACKROCK BASIC VALUE FUND, INC.
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Fund Overview Key Facts about BlackRock Basic Value Fund, Inc.
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The investment objective of the BlackRock Basic Value Fund, Inc. (the "Fund") is to seek capital appreciation and,
Objective, Secondary [Text Block]	rr_ObjectiveSecondaryTextBlock	secondarily, income by investing in securities, primarily equity securities, that management of the Fund believes are undervalued and therefore represent basic investment value.
Expense [Heading]	rr_ExpenseHeading	Fees and Expenses of the Fund
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $25,000 in the BlackRock-advised fund complex. More information about these and other discounts is available from your financial professional and in the "Details about the Share Classes" section on page 17 of the Fund's prospectus and in the "Purchase of Shares" section on page II-58 of the Fund's statement of additional information.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	November 1, 2013
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio Turnover:
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 38% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	38.00%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	A contingent deferred sales charge (“CDSC”) of 0.75% is assessed on certain redemptions of Investor A Shares made within 18 months after purchase where no initial sales charge was paid at time of purchase as part of an investment of $1,000,000 or more.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $25,000 in the BlackRock-advised fund complex.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	25,000
Expenses Represent Both Master and Feeder [Text]	rr_ExpensesRepresentBothMasterAndFeeder	The fees and expenses shown in the table and the example that follows include both the expenses of the Fund and the Fund’s share of the allocated expenses of Master Basic Value LLC (the “Master LLC”). Management Fees are paid by the Master LLC.
Expense Example [Heading]	rr_ExpenseExampleHeading	Example:
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	You would pay the following expenses if you did not redeem your shares:
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategies of the Fund
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund is a "feeder" fund that invests all of its assets in Master Basic Value LLC (the "Master LLC"), which has the same investment objectives and strategies as the Fund. All investments are made at the Master LLC level. This structure is sometimes called a "master/feeder" structure. The Fund's investment results will correspond directly to the investment results of the Master LLC. Where applicable, the "Fund" refers also to the Master LLC. The Fund invests primarily in equity securities that Fund management believes are undervalued, which means that their prices are less than Fund management believes they are worth. Equity securities primarily consist of common stock, preferred stock, securities convertible into common stock, or securities or other instruments whose price is linked to the value of common stock. Fund management places particular emphasis on companies with below average price/earnings ratios that may pay above average dividends. The Fund invests primarily in common stock of U.S. companies. The Fund focuses on companies with market capitalizations of over $5 billion.
Risk [Heading]	rr_RiskHeading	Principal Risks of Investing in the Fund
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time. You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments. The following is a summary description of principal risks of investing in the Fund. Equity Securities Risk — Stock markets are volatile. The price of equity securities fluctuates based on changes in a company's financial condition and overall market and economic conditions. Foreign Securities Risk — Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include: The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight. Changes in foreign currency exchange rates can affect the value of the Fund's portfolio. The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position. The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries. Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws. Settlement and clearance procedures in certain foreign markets may result in delays in payment for or delivery of securities not typically associated with settlement and clearance of U.S. investments. The European financial markets have recently experienced volatility and adverse trends due to concerns about economic downturns in, or rising government debt levels of several European countries. These events have adversely affected the exchange rate of the Euro and may spread to other countries in Europe, including countries that do not use the Euro. These events may affect the value and liquidity of certain of the Fund's investments. Investment Style Risk — Because different kinds of stocks go in and out of favor depending on market conditions, the Fund's performance may be better or worse than other funds with different investment styles (e.g., growth vs. value, large cap vs. small cap). Market Risk and Selection Risk — Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.
Risk Lose Money [Text]	rr_RiskLoseMoney	You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Performance Information
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. The table compares the Fund's performance to that of the Russell 1000® Value Index and the Standard & Poor's ("S&P") 500® Index, which are relevant to the Fund because they have characteristics similar to the Fund's investment strategies. The returns for Class R Shares prior to January 3, 2003, the commencement of operations for Class R Shares, are based upon performance of the Fund's Institutional Shares. The returns for Class R Shares, however, are adjusted to reflect the distribution and service (12b-1) fees applicable to Class R Shares. As with all such investments, past performance (before and after taxes) is not an indication of future results. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. However, the table includes all applicable fees and sales charges. If the Fund's investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund's returns would have been lower. Updated information on the Fund's performance can be obtained by visiting http://www.blackrock.com/funds or can be obtained by phone at 800-882-0052.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund.
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	800-882-0052
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	http://www.blackrock.com/funds
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	As with all such investments, past performance (before and after taxes) is not an indication of future results.
Bar Chart [Heading]	rr_BarChartHeading	Investor A Shares ANNUAL TOTAL RETURNS BlackRock Basic Value Fund, Inc. As of 12/31
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	During the ten-year period shown in the bar chart, the highest return for a quarter was 18.14% (quarter ended June 30, 2003) and the lowest return for a quarter was –20.50% (quarter ended December 31, 2008). The year-to-date return as of September 30, 2012 was 12.65%.
Performance Table Heading	rr_PerformanceTableHeading	As of 12/31/11 Average Annual Total Returns
Performance Table Does Reflect Sales Loads	rr_PerformanceTableDoesReflectSalesLoads	However, the table includes all applicable fees and sales charges.
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax returns are shown for Investor A Shares only, and the after-tax returns for Investor B, Investor C, Institutional and Class R Shares will vary.
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Investor A Shares only, and the after-tax returns for Investor B, Investor C, Institutional and Class R Shares will vary.
BLACKROCK BASIC VALUE FUND, INC. | Investor A Shares
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.25%
Maximum Deferred Sales Charge (Load) (as percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none	[1]
Management Fee	rr_ManagementFeesOverAssets	0.41%	[2]
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%	[2]
Other Expenses	rr_OtherExpensesOverAssets	0.20%	[2]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.86%	[2]
1 Year	rr_ExpenseExampleYear01	608
3 Years	rr_ExpenseExampleYear03	785
5 Years	rr_ExpenseExampleYear05	977
10 Years	rr_ExpenseExampleYear10	1,530
2001	rr_AnnualReturn2001	(0.73%)
2002	rr_AnnualReturn2002	(17.03%)
2003	rr_AnnualReturn2003	32.43%
2004	rr_AnnualReturn2004	10.17%
2005	rr_AnnualReturn2005	3.60%
2006	rr_AnnualReturn2006	22.36%	[3]
2007	rr_AnnualReturn2007	0.97%
2008	rr_AnnualReturn2008	(36.62%)
2009	rr_AnnualReturn2009	30.45%
2010	rr_AnnualReturn2010	12.61%
Year to Date Return, Label	rr_YearToDateReturnLabel	year-to-date return
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	12.65%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	highest return
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2003
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	18.14%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	lowest return
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(20.50%)
1 Year	rr_AverageAnnualReturnYear01	(8.07%)
5 Years	rr_AverageAnnualReturnYear05	(2.88%)
10 Years	rr_AverageAnnualReturnYear10	2.86%	[3]
BLACKROCK BASIC VALUE FUND, INC. | Investor B Shares
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	4.50%	[4]
Management Fee	rr_ManagementFeesOverAssets	0.41%	[2]
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%	[2]
Other Expenses	rr_OtherExpensesOverAssets	0.46%	[2]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.87%	[2]
1 Year	rr_ExpenseExampleYear01	640
3 Years	rr_ExpenseExampleYear03	938
5 Years	rr_ExpenseExampleYear05	1,211
10 Years	rr_ExpenseExampleYear10	1,926
1 Year	rr_ExpenseExampleNoRedemptionYear01	190
3 Years	rr_ExpenseExampleNoRedemptionYear03	588
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,011
10 Years	rr_ExpenseExampleNoRedemptionYear10	1,926
1 Year	rr_AverageAnnualReturnYear01	(8.21%)
5 Years	rr_AverageAnnualReturnYear05	(3.05%)
10 Years	rr_AverageAnnualReturnYear10	2.75%	[3]
BLACKROCK BASIC VALUE FUND, INC. | Investor C Shares
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	1.00%	[5]
Management Fee	rr_ManagementFeesOverAssets	0.41%	[2]
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%	[2]
Other Expenses	rr_OtherExpensesOverAssets	0.26%	[2]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.67%	[2]
1 Year	rr_ExpenseExampleYear01	270
3 Years	rr_ExpenseExampleYear03	526
5 Years	rr_ExpenseExampleYear05	907
10 Years	rr_ExpenseExampleYear10	1,976
1 Year	rr_ExpenseExampleNoRedemptionYear01	170
3 Years	rr_ExpenseExampleNoRedemptionYear03	526
5 Years	rr_ExpenseExampleNoRedemptionYear05	907
10 Years	rr_ExpenseExampleNoRedemptionYear10	1,976
1 Year	rr_AverageAnnualReturnYear01	(4.70%)
5 Years	rr_AverageAnnualReturnYear05	(2.62%)
10 Years	rr_AverageAnnualReturnYear10	2.60%	[3]
BLACKROCK BASIC VALUE FUND, INC. | Institutional Shares
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Management Fee	rr_ManagementFeesOverAssets	0.41%	[2]
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none	[2]
Other Expenses	rr_OtherExpensesOverAssets	0.15%	[2]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.56%	[2]
1 Year	rr_ExpenseExampleYear01	57
3 Years	rr_ExpenseExampleYear03	179
5 Years	rr_ExpenseExampleYear05	313
10 Years	rr_ExpenseExampleYear10	701
1 Year	rr_AverageAnnualReturnYear01	(2.69%)
5 Years	rr_AverageAnnualReturnYear05	(1.53%)
10 Years	rr_AverageAnnualReturnYear10	3.71%	[3]
BLACKROCK BASIC VALUE FUND, INC. | Class R Shares
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Management Fee	rr_ManagementFeesOverAssets	0.41%	[2]
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.50%	[2]
Other Expenses	rr_OtherExpensesOverAssets	0.31%	[2]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.22%	[2],[6]
1 Year	rr_ExpenseExampleYear01	124
3 Years	rr_ExpenseExampleYear03	387
5 Years	rr_ExpenseExampleYear05	670
10 Years	rr_ExpenseExampleYear10	1,477
1 Year	rr_AverageAnnualReturnYear01	(3.36%)
5 Years	rr_AverageAnnualReturnYear05	(2.18%)
10 Years	rr_AverageAnnualReturnYear10	3.15%	[3]
BLACKROCK BASIC VALUE FUND, INC. | Return After Taxes on Distributions | Investor A Shares
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(8.72%)
5 Years	rr_AverageAnnualReturnYear05	(3.91%)
10 Years	rr_AverageAnnualReturnYear10	1.67%	[3]
BLACKROCK BASIC VALUE FUND, INC. | Return After Taxes on Distributions and Sale of Shares | Investor A Shares
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(5.08%)
5 Years	rr_AverageAnnualReturnYear05	(2.77%)
10 Years	rr_AverageAnnualReturnYear10	2.05%	[3]
BLACKROCK BASIC VALUE FUND, INC. | Russell 1000 Value Index (Reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	0.39%
5 Years	rr_AverageAnnualReturnYear05	(2.64%)
10 Years	rr_AverageAnnualReturnYear10	3.89%	[3]
BLACKROCK BASIC VALUE FUND, INC. | S&P 500 Index (Reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	2.11%
5 Years	rr_AverageAnnualReturnYear05	(0.25%)
10 Years	rr_AverageAnnualReturnYear10	2.92%	[3]

[1] A contingent deferred sales charge ("CDSC") of 0.75% is assessed on certain redemptions of Investor A Shares made within 18 months after purchase where no initial sales charge was paid at time of purchase as part of an investment of $1,000,000 or more.

[2] The fees and expenses shown in the table and the example that follows include both the expenses of the Fund and the Fund's share of the allocated expenses of Master Basic Value LLC (the "Master LLC"). Management Fees are paid by the Master LLC.

[3] A portion of the Fund's total return was attributable to payments by the previous investment adviser for compensation as a result of a securities class action entitlement recovery and as a result of a corporate action in the fiscal year ended June 30, 2006.

[4] The CDSC is 4.50% if shares are redeemed in less than one year. The CDSC for Investor B Shares decreases for redemptions made in subsequent years. After six years there is no CDSC on Investor B Shares. (See the section "Details about the Share Classes - Investor B Shares" in the Fund's prospectus for the complete schedule of CDSCs.)

[5] There is no CDSC on Investor C Shares after one year.

[6] As described in the "Management of the Funds" section of the Fund's prospectus on page 32, BlackRock has contractually agreed to waive and/or reimburse fees or expenses in order to limit Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements (excluding Dividend Expense, Interest Expense, Acquired Fund Fees and Expenses and certain other Fund expenses) to 1.22% (for Class R Shares) of average daily net assets until November 1, 2013. The contractual agreement may be terminated upon 90 days' notice by a majority of the non-interested trustees of the Fund or by a vote of a majority of the outstanding voting securities of the Fund.

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BLACKROCK BASIC VALUE FUND, INC.

Fund Overview

Key Facts about BlackRock Basic Value Fund, Inc.

Investment Objective

The investment objective of the BlackRock Basic Value Fund, Inc. (the "Fund") is to seek capital appreciation and,

secondarily, income by investing in securities, primarily equity securities, that management of the Fund believes are undervalued and therefore represent basic investment value.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $25,000 in the BlackRock-advised fund complex. More information about these and other discounts is available from your financial professional and in the "Details about the Share Classes" section on page 17 of the Fund's prospectus and in the "Purchase of Shares" section on page II-58 of the Fund's statement of additional information.

Shareholder Fees
(fees paid directly from your investment)

Shareholder Fees BLACKROCK BASIC VALUE FUND, INC.	Investor A Shares		Investor B Shares		Investor C Shares		Institutional Shares	Class R Shares
Maximum Sales Charge (Load) Imposed on Purchases (as percentage of offering price)	5.25%		none		none		none	none
Maximum Deferred Sales Charge (Load) (as percentage of offering price or redemption proceeds, whichever is lower)	none	[1]	4.50%	[2]	1.00%	[3]	none	none

Annual Fund Operating Expenses
(expenses that you pay each year as a
percentage of the value of your investment)

Annual Fund Operating Expenses BLACKROCK BASIC VALUE FUND, INC.		Investor A Shares	Investor B Shares	Investor C Shares	Institutional Shares	Class R Shares
Management Fee	[1]	0.41%	0.41%	0.41%	0.41%	0.41%
Distribution and/or Service (12b-1) Fees	[1]	0.25%	1.00%	1.00%	none	0.50%
Other Expenses	[1]	0.20%	0.46%	0.26%	0.15%	0.31%
Total Annual Fund Operating Expenses	[1]	0.86%	1.87%	1.67%	0.56%	1.22%	[2]

Example:

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example BLACKROCK BASIC VALUE FUND, INC. (USD $)	1 Year	3 Years	5 Years	10 Years
Investor A Shares	608	785	977	1,530
Investor B Shares	640	938	1,211	1,926
Investor C Shares	270	526	907	1,976
Institutional Shares	57	179	313	701
Class R Shares	124	387	670	1,477

You would pay the following expenses if you did not redeem your shares:

Expense Example, No Redemption BLACKROCK BASIC VALUE FUND, INC. (USD $)	1 Year	3 Years	5 Years	10 Years
Investor B Shares	190	588	1,011	1,926
Investor C Shares	170	526	907	1,976

Portfolio Turnover:

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 38% of the average value of its portfolio.

Principal Investment Strategies of the Fund

The Fund is a "feeder" fund that invests all of its assets in Master Basic Value LLC (the "Master LLC"), which has the same investment objectives and strategies as the Fund. All investments are made at the Master LLC level. This structure is sometimes called a "master/feeder" structure. The Fund's investment results will correspond directly to the investment results of the Master LLC. Where applicable, the "Fund" refers also to the Master LLC.

The Fund invests primarily in equity securities that Fund management believes are undervalued, which means that their prices are less than Fund management believes they are worth. Equity securities primarily consist of common stock, preferred stock, securities convertible into common stock, or securities or other instruments whose price is linked to the value of common stock. Fund management places particular emphasis on companies with below average price/earnings ratios that may pay above average dividends. The Fund invests primarily in common stock of U.S. companies. The Fund focuses on companies with market capitalizations of over $5 billion.

Principal Risks of Investing in the Fund

Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time. You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments. The following is a summary description of principal risks of investing in the Fund.

• Equity Securities Risk — Stock markets are volatile. The price of equity securities fluctuates based on changes in a company's financial condition and overall market and economic conditions.

• Foreign Securities Risk — Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:

• The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.

• Changes in foreign currency exchange rates can affect the value of the Fund's portfolio.

• The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position.

• The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries.

• Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.

• Settlement and clearance procedures in certain foreign markets may result in delays in payment for or delivery of securities not typically associated with settlement and clearance of U.S. investments.

• The European financial markets have recently experienced volatility and adverse trends due to concerns about economic downturns in, or rising government debt levels of several European countries. These events have adversely affected the exchange rate of the Euro and may spread to other countries in Europe, including countries that do not use the Euro. These events may affect the value and liquidity of certain of the Fund's investments.

• Investment Style Risk — Because different kinds of stocks go in and out of favor depending on market conditions, the Fund's performance may be better or worse than other funds with different investment styles (e.g., growth vs. value, large cap vs. small cap).

• Market Risk and Selection Risk — Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.

Performance Information

The information shows you how the Fund's performance has varied year by year and provides some indication of the risks of investing in the Fund. The table compares the Fund's performance to that of the Russell 1000^® Value Index and the Standard & Poor's ("S&P") 500^® Index, which are relevant to the Fund because they have characteristics similar to the Fund's investment strategies. The returns for Class R Shares prior to January 3, 2003, the commencement of operations for Class R Shares, are based upon performance of the Fund's Institutional Shares. The returns for Class R Shares, however, are adjusted to reflect the distribution and service (12b-1) fees applicable to Class R Shares. As with all such investments, past performance (before and after taxes) is not an indication of future results. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. However, the table includes all applicable fees and sales charges. If the Fund's investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund's returns would have been lower. Updated information on the Fund's performance can be obtained by visiting http://www.blackrock.com/funds or can be obtained by phone at 800-882-0052.

Investor A Shares ANNUAL TOTAL RETURNS BlackRock Basic Value Fund, Inc. As of 12/31

During the ten-year period shown in the bar chart, the highest return for a quarter was 18.14% (quarter ended June 30, 2003) and the lowest return for a quarter was –20.50% (quarter ended December 31, 2008). The year-to-date return as of September 30, 2012 was 12.65%.

As of 12/31/11
Average Annual Total Returns

Average Annual Total Returns BLACKROCK BASIC VALUE FUND, INC.	1 Year	5 Years	10 Years
Investor A	(8.07%)	(2.88%)	2.86%	[1]
Investor A Return After Taxes on Distributions	(8.72%)	(3.91%)	1.67%	[1]
Investor A Return After Taxes on Distributions and Sale of Shares	(5.08%)	(2.77%)	2.05%	[1]
Investor B	(8.21%)	(3.05%)	2.75%	[1]
Investor C	(4.70%)	(2.62%)	2.60%	[1]
Institutional	(2.69%)	(1.53%)	3.71%	[1]
Class R	(3.36%)	(2.18%)	3.15%	[1]
Russell 1000 Value Index (Reflects no deduction for fees, expenses or taxes)	0.39%	(2.64%)	3.89%	[1]
S&P 500 Index (Reflects no deduction for fees, expenses or taxes)	2.11%	(0.25%)	2.92%	[1]

After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Investor A Shares only, and the after-tax returns for Investor B, Investor C, Institutional and Class R Shares will vary.

[1] A contingent deferred sales charge ("CDSC") of 0.75% is assessed on certain redemptions of Investor A Shares made within 18 months after purchase where no initial sales charge was paid at time of purchase as part of an investment of $1,000,000 or more.

[2] The CDSC is 4.50% if shares are redeemed in less than one year. The CDSC for Investor B Shares decreases for redemptions made in subsequent years. After six years there is no CDSC on Investor B Shares. (See the section "Details about the Share Classes - Investor B Shares" in the Fund's prospectus for the complete schedule of CDSCs.)

[3] There is no CDSC on Investor C Shares after one year.

[1] The fees and expenses shown in the table and the example that follows include both the expenses of the Fund and the Fund's share of the allocated expenses of Master Basic Value LLC (the "Master LLC"). Management Fees are paid by the Master LLC.

[2] As described in the "Management of the Funds" section of the Fund's prospectus on page 32, BlackRock has contractually agreed to waive and/or reimburse fees or expenses in order to limit Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements (excluding Dividend Expense, Interest Expense, Acquired Fund Fees and Expenses and certain other Fund expenses) to 1.22% (for Class R Shares) of average daily net assets until November 1, 2013. The contractual agreement may be terminated upon 90 days' notice by a majority of the non-interested trustees of the Fund or by a vote of a majority of the outstanding voting securities of the Fund.

[1] A portion of the Fund's total return was attributable to payments by the previous investment adviser for compensation as a result of a securities class action entitlement recovery and as a result of a corporate action in the fiscal year ended June 30, 2006.

[1] A portion of the Fund's total return was attributable to payments by the previous investment adviser for compensation as a result of a securities class action entitlement recovery and as a result of a corporate action in the fiscal year ended June 30, 2006.

XML

Document and Entity Information	12 Months Ended
	Oct. 26, 2012
Risk/Return:
Document Type	485BPOS
Document Period End Date	Jun. 30, 2012
Registrant Name	BLACKROCK BASIC VALUE FUND, INC.
Central Index Key	0000216557
Amendment Flag	false
Document Creation Date	Oct. 26, 2012
Document Effective Date	Oct. 26, 2012
Prospectus Date	Oct. 26, 2012

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	BLACKROCK BASIC VALUE FUND, INC.
Prospectus Date	rr_ProspectusDate	Oct. 26, 2012
Document Creation Date	dei_DocumentCreationDate	Oct. 26, 2012