Untitled Document

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	485BPOS
Document Period End Date	dei_DocumentPeriodEndDate	Dec. 31, 2017
Registrant Name	dei_EntityRegistrantName	T. Rowe Price Small-Cap Stock Fund, Inc.
Central Index Key	dei_EntityCentralIndexKey	0000075170
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Apr. 26, 2018
Document Effective Date	dei_DocumentEffectiveDate	May 01, 2018
Prospectus Date	rr_ProspectusDate	May 01, 2018

Risk/Return:

rr_RiskReturnAbstract

Prospectus Date

rr_ProspectusDate

May 01, 2018

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Fees and Expenses of the Fund

Shareholder fees (fees paid directly from your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

36.30%

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, 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:

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The fund will normally invest at least 80% of its net assets (including any borrowings for investment purposes) in stocks of small companies. The fund defines a small company as one whose market capitalization falls (i) within or below the current range of companies in either the Russell 2000^® Index or the S&P SmallCap 600 Index or (ii) below the three-year average maximum market cap of companies in either index as of December 31 of the three preceding years. The Russell 2000 and S&P SmallCap 600 Indices are widely used benchmarks for tracking small-cap stock performance. As of December 31, 2017, the market capitalization ranges for the Russell 2000 Index and the S&P SmallCap 600 Index were approximately $22.7 million to $9.4 billion, and $95.5 million to $24.4 billion, respectively. The market capitalizations of the companies in the fund’s portfolio and the S&P and Russell indexes change over time; the fund will not automatically sell or cease to purchase stock of a company it already owns just because the company’s market capitalization grows or falls outside this range. The fund may, on occasion, purchase companies with a market capitalization above the ranges. When choosing stocks, we generally look for one or more of the following characteristics:

capable management;

attractive business niches;

pricing flexibility;

sound financial and accounting practices;

a potential or demonstrated ability to grow revenues, earnings, and cash flow consistently; and

the potential for a catalyst (such as increased investor attention, asset sales, strong business prospects, or a change in management) to cause the stock’s price to rise.

Holdings will be widely diversified by industry and issuer, and stock selection may reflect either a growth or value investment approach. For example, we may look for a company whose price/earnings ratio is attractive relative to the underlying earnings growth rate. A value stock would be one where the stock price appears undervalued in relation to earnings, projected cash flow, or asset value per share.

In pursuing its investment objective, the fund has the discretion to deviate from its normal investment criteria. These situations might arise when the fund’s adviser believes a security could increase in value for a variety of reasons, including an extraordinary corporate event, a new product introduction or innovation, a favorable competitive development, or a change in management.

While most assets will typically be invested in U.S. common stocks, the fund may invest in foreign stocks in keeping with the fund’s objective.

The fund may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

As with any mutual fund, there is no guarantee that the fund will achieve its objective. The fund’s share price fluctuates, which means you could lose money by investing in the fund. The principal risks of investing in this fund are summarized as follows:

Active management risks The investment adviser’s judgments about the attractiveness, value, or potential appreciation of the fund’s investments may prove to be incorrect. The fund could underperform in comparison to other funds with a similar benchmark or similar objectives and investment strategies if the fund’s overall investment selections or strategies fail to produce the intended results.

Risks of U.S. stock investing Stocks generally fluctuate in value more than bonds and may decline significantly over short time periods. There is a chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising and falling prices. The value of a stock in which the fund invests may decline due to general weakness in the U.S. stock market, such as when the U.S. financial markets decline, or because of factors that affect a particular company or industry.

Investment style risks Different investment styles tend to shift in and out of favor depending on market conditions and investor sentiment. Because the fund may hold stocks with either growth or value characteristics, it could underperform other stock funds that take a strictly growth or value approach to investing when one style is currently in favor. Growth stocks tend to be more volatile than the overall stock market and can have sharp price declines as a result of earnings disappointments. Value stocks carry the risk that the market will not recognize their intrinsic value or that they are actually appropriately priced at a low level.

Small-cap stock risks Investing primarily in issuers within the same market capitalization category carries the risk that the category may be out of favor due to current market conditions or investor sentiment. Because the fund invests primarily in securities issued by small-cap companies, it is likely to be more volatile than a fund that focuses on securities issued by larger companies. Small companies often have less experienced management, narrower product lines, more limited financial resources, and less publicly available information than larger companies. In addition, smaller companies are typically more sensitive to changes in overall economic conditions and their securities may be difficult to trade.

Foreign investing risks The fund’s investments in foreign securities may be adversely affected by local, political, social, and economic conditions overseas, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar. These risks are heightened for the fund’s investments in emerging markets, which are more susceptible to governmental interference, less efficient trading markets, and the imposition of local taxes or restrictions on gaining access to sales proceeds for foreign investors.

Bar Chart and Performance Table [Heading]

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Performance

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following performance information provides some indication of the risks of investing in the fund.

The following bar chart illustrates how much returns can differ from year to year by showing calendar year returns and the best and worst calendar quarter returns during those years for the fund’s Investor Class. Returns for other share classes vary since they have different expenses.

The following table shows the average annual total returns for each class of the fund that has been in operation for at least one full calendar year, and also compares the returns with the returns of a relevant broad-based market index, as well as with the returns of one or more comparative indexes that have investment characteristics similar to those of the fund.

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

The fund’s performance information represents only past performance (before and after taxes) and is not necessarily an indication of future results.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

	Quarter Ended	Total Return		Quarter Ended	Total Return
Best Quarter	6/30/09	21.12%	Worst Quarter	12/31/08	-23.83%

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 One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns are shown only for the Investor Class and will differ for other share classes.

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

Updated performance information is available through troweprice.com.

Risk/Return:

rr_RiskReturnAbstract

Management fees

rr_ManagementFeesOverAssets

0.74%

Other expenses

rr_OtherExpensesOverAssets

0.15%

1 year

rr_ExpenseExampleYear01

$ 91

5 years

rr_ExpenseExampleYear05

493

2008

rr_AnnualReturn2008

(33.35%)

2010

rr_AnnualReturn2010

32.53%

2012

rr_AnnualReturn2012

18.01%

2014

rr_AnnualReturn2014

6.90%

2016

rr_AnnualReturn2016

18.57%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best Quarter

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

21.12%

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

1 Year

rr_AverageAnnualReturnYear01

15.27%

10 Years

rr_AverageAnnualReturnYear10

10.88%

Inception date

rr_AverageAnnualReturnInceptionDate

Jun. 01, 1956

Risk/Return:

rr_RiskReturnAbstract

Management fees

rr_ManagementFeesOverAssets

0.74%

Other expenses

rr_OtherExpensesOverAssets

0.01%

1 year

rr_ExpenseExampleYear01

$ 77

5 years

rr_ExpenseExampleYear05

417

1 Year

rr_AverageAnnualReturnYear01

15.43%

10 Years

rr_AverageAnnualReturnYear10

Inception date

rr_AverageAnnualReturnInceptionDate

Aug. 28, 2015

Risk/Return:

rr_RiskReturnAbstract

Management fees

rr_ManagementFeesOverAssets

0.74%

Other expenses

rr_OtherExpensesOverAssets

0.16%

1 year

rr_ExpenseExampleYear01

$ 117

5 years

rr_ExpenseExampleYear05

633

1 Year

rr_AverageAnnualReturnYear01

14.96%

10 Years

rr_AverageAnnualReturnYear10

10.59%

Inception date

rr_AverageAnnualReturnInceptionDate

Mar. 31, 2000

Risk/Return:

rr_RiskReturnAbstract

5 Years

rr_AverageAnnualReturnYear05

12.51%

Since inception

rr_AverageAnnualReturnSinceInception

1 Year

rr_AverageAnnualReturnYear01

10.30%

10 Years

rr_AverageAnnualReturnYear10

8.79%

Inception date

rr_AverageAnnualReturnInceptionDate

Jun. 01, 1956

Risk/Return:

rr_RiskReturnAbstract

5 Years

rr_AverageAnnualReturnYear05

14.12%

Since inception

rr_AverageAnnualReturnSinceInception

14.25%

^[2]

1 Year

rr_AverageAnnualReturnYear01

13.23%

10 Years

rr_AverageAnnualReturnYear10

10.43%

Inception date

rr_AverageAnnualReturnInceptionDate

Aug. 28, 2015

Risk/Return:

rr_RiskReturnAbstract

5 Years

rr_AverageAnnualReturnYear05

13.64%

Since inception

rr_AverageAnnualReturnSinceInception

14.55%

^[2]


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


Signature	Title	Date


/s/Edward C. Bernard	Chairman of the Board	May 15, 2018
Edward C. Bernard	(Chief Executive Officer)


/s/Catherine D. Mathews	Treasurer	May 15, 2018
Catherine D. Mathews	(Chief Financial Officer)
	and Vice President

*
Teresa Bryce Bazemore	Director	May 15, 2018


*
Ronald J. Daniels	Director	May 15, 2018


*
Bruce W. Duncan	Director	May 15, 2018


*
Robert J. Gerrard, Jr.	Director	May 15, 2018


*
Paul F. McBride	Director	May 15, 2018


*
Cecilia E. Rouse	Director	May 15, 2018


*
John G. Schreiber	Director	May 15, 2018



/s/Robert W. Sharps	Director	May 15, 2018
Robert W. Sharps


*
Mark. R. Tercek	Director	May 15, 2018


*/s/David Oestreicher	Vice President and	May 15, 2018
David Oestreicher	Attorney-In-Fact


ALL CORPORATIONS/TRUSTS /s/Edward C. Bernard
Edward C. Bernard /s/Catherine D. Mathews	Chairman of the Board (Principal Executive Officer) Director/Trustee	April 27, 2017
Catherine D. Mathews /s/Anthony W. Deering	Treasurer (Principal Financial Officer) Vice President	April 27, 2017
Anthony W. Deering /s/Bruce W. Duncan	Director/Trustee	April 27, 2017
Bruce W. Duncan /s/Robert J. Gerrard, Jr.	Director/Trustee	April 27, 2017
Robert J. Gerrard, Jr. /s/Paul F. McBride	Director/Trustee	April 27, 2017
Paul F. McBride /s/Cecilia E. Rouse	Director/Trustee	April 27, 2017
Cecilia E. Rouse /s/John G. Schreiber	Director/Trustee	April 27, 2017
John G. Schreiber /s/Mark R. Tercek	Director/Trustee	April 27, 2017
Mark R. Tercek	Director/Trustee	April 27, 2017


/s/Teresa Bryce Bazemore
Teresa Bryce Bazemore, Director	Date: January 1, 2018


/s/Ronald J. Daniels
Ronald J. Daniels, Director	Date: January 1, 2018


Darrell N. Braman, Secretary


Darrell N. Braman, Secretary


Darrell N. Braman, Secretary