-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 QudPtsCZvF2WkkOg9D1smSykc3GnIsZ2138piXGxkI0zcm0ro/M9wpmVD2gsgCaU
 ba2yYILNJMQr2EBHu/dtFA==

<SEC-DOCUMENT>0001241978-06-000002.txt : 20061109
<SEC-HEADER>0001241978-06-000002.hdr.sgml : 20061109
<ACCEPTANCE-DATETIME>20061109092056
ACCESSION NUMBER:		0001241978-06-000002
CONFORMED SUBMISSION TYPE:	5
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20060930
FILED AS OF DATE:		20061109
DATE AS OF CHANGE:		20061109

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			FIRST KEYSTONE FINANCIAL INC
		CENTRAL INDEX KEY:			0000856751
		STANDARD INDUSTRIAL CLASSIFICATION:	SAVINGS INSTITUTION, FEDERALLY CHARTERED [6035]
		IRS NUMBER:				232576479
		FISCAL YEAR END:			0930

	BUSINESS ADDRESS:	
		STREET 1:		22 WEST STATE ST
		CITY:			MEDIA
		STATE:			PA
		ZIP:			19063
		BUSINESS PHONE:		610 565-6210

	MAIL ADDRESS:	
		STREET 1:		22 WEST STATE ST
		CITY:			MEDIA
		STATE:			PA
		ZIP:			19063

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			SOSS MARSHALL J
		CENTRAL INDEX KEY:			0001241978

	FILING VALUES:
		FORM TYPE:		5
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-25328
		FILM NUMBER:		061199657

	MAIL ADDRESS:	
		STREET 1:		105 AUGUSTA DR
		CITY:			W CHESTER
		STATE:			PA
		ZIP:			19382
</SEC-HEADER>
<DOCUMENT>
<TYPE>5
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>5</documentType>

    <periodOfReport>2006-09-30</periodOfReport>

    <form3HoldingsReported>0</form3HoldingsReported>

    <form4TransactionsReported>0</form4TransactionsReported>

    <issuer>
        <issuerCik>0000856751</issuerCik>
        <issuerName>FIRST KEYSTONE FINANCIAL INC</issuerName>
        <issuerTradingSymbol>FKFS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001241978</rptOwnerCik>
            <rptOwnerName>SOSS MARSHALL J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>105 AUGUSTA DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>WEST CHESTER</rptOwnerCity>
            <rptOwnerState>PA</rptOwnerState>
            <rptOwnerZipCode>19382</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>common stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3434</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes></footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Marshall J. Soss</signatureName>
        <signatureDate>2006-11-09</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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