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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 PYakA/X3xka9icLbWnU1ZW8agKZ0PDMTyBtevEK/3sY9kjrfjSVIvZiDhm1Eu1gr
 T1gJKN4bbxlycwjq1juSVg==

<SEC-DOCUMENT>0000065103-07-000199.txt : 20071115
<SEC-HEADER>0000065103-07-000199.hdr.sgml : 20071115
<ACCEPTANCE-DATETIME>20071115150200
ACCESSION NUMBER:		0000065103-07-000199
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20071114
FILED AS OF DATE:		20071115
DATE AS OF CHANGE:		20071115

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BLACKROCK MUNIYIELD FUND INC
		CENTRAL INDEX KEY:			0000879361
		STANDARD INDUSTRIAL CLASSIFICATION:	UNKNOWN SIC - 0000 [0000]
		IRS NUMBER:				223136942
		STATE OF INCORPORATION:			NJ
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		PO BOX 9011
		CITY:			PRINCETON
		STATE:			NJ
		ZIP:			08543-9011
		BUSINESS PHONE:		6092822800

	MAIL ADDRESS:	
		STREET 1:		PO BOX 9011
		CITY:			PRINCETON
		STATE:			NJ
		ZIP:			08543-9011

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MUNIYIELD FUND INC
		DATE OF NAME CHANGE:	19920717

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			JAECKEL THEODORE R JR
		CENTRAL INDEX KEY:			0001081503

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	811-06414
		FILM NUMBER:		071249392

	BUSINESS ADDRESS:	
		STREET 1:		MERRILL LYNCH ASSET MANAGEMENT
		STREET 2:		800 SCUDDER MILL ROAD
		CITY:			PLAINSBORO
		STATE:			NJ
		ZIP:			085636
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2007-11-14</periodOfReport>

    <issuer>
        <issuerCik>0000879361</issuerCik>
        <issuerName>BLACKROCK MUNIYIELD FUND INC</issuerName>
        <issuerTradingSymbol>MYD</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001081503</rptOwnerCik>
            <rptOwnerName>JAECKEL THEODORE R JR</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>800 SCUDDERS MILL ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>PLAINSBORO</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>08536</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Portfolio Manager</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common</value>
            </securityTitle>
            <transactionDate>
                <value>2007-11-14</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>2000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>13.12</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2003.8833</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes></footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Martha Smith, Jr., Power of Attorney</signatureName>
        <signatureDate>2007-11-15</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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