    <SEC-DOCUMENT>0001193125-14-257813-index.html : 20140701
    <SEC-HEADER>0001193125-14-257813.hdr.sgml : 20140701
    <ACCEPTANCE-DATETIME>20140701165808
    ACCESSION NUMBER:		0001193125-14-257813
    CONFORMED SUBMISSION TYPE:	N-CSR
    PUBLIC DOCUMENT COUNT:		20
    CONFORMED PERIOD OF REPORT:	20140430
    FILED AS OF DATE:		20140701
    DATE AS OF CHANGE:		20140701
    EFFECTIVENESS DATE:		20140701

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			BLACKROCK MUNIASSETS FUND, INC.
    		CENTRAL INDEX KEY:			0000901243
    		IRS NUMBER:				223239638
    		STATE OF INCORPORATION:			MD
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		N-CSR
    		SEC ACT:		1940 Act
    		SEC FILE NUMBER:	811-07642
    		FILM NUMBER:		14953277

    	BUSINESS ADDRESS:
    		STREET 1:		100 BELLEVUE PARKWAY
    		CITY:			WILMINGTON
    		STATE:			DE
    		ZIP:			19809
    		BUSINESS PHONE:		800-441-7762

    	MAIL ADDRESS:
    		STREET 1:		100 BELLEVUE PARKWAY
    		CITY:			WILMINGTON
    		STATE:			DE
    		ZIP:			19809

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	MUNIASSETS FUND INC
    		DATE OF NAME CHANGE:	19930714

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	MUNIINCOME FUND INC
    		DATE OF NAME CHANGE:	19930517
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>N-CSR
    <SEQUENCE>1
    <FILENAME>d718987dncsr.htm
    <DESCRIPTION>BLACKROCK MUNIASSETS FUND, INC.
    <TEXT>
    Document 1 - file: d718987dncsr.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CERT
    <SEQUENCE>2
    <FILENAME>d718987dex99cert.htm
    <DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 302
    <TEXT>
    Document 2 - file: d718987dex99cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.906CERT
    <SEQUENCE>3
    <FILENAME>d718987dex99906cert.htm
    <DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 906
    <TEXT>
    Document 3 - file: d718987dex99906cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.PROXYPOL
    <SEQUENCE>4
    <FILENAME>d718987dex99proxypol.htm
    <DESCRIPTION>PROXY VOTING POLICY
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    <DESCRIPTION>GRAPHIC
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    <DESCRIPTION>GRAPHIC
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    Document 8 - file: g718987g09g62.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 9 - file: g718987g09h65.jpg

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    Document 10 - file: g718987g12a49.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 11 - file: g718987g41l68.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 12 - file: g718987g51n99.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 17 - file: g718987g98u13.jpg

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    <SEQUENCE>18
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    <DESCRIPTION>GRAPHIC
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    <SEQUENCE>19
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    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 19 - file: g719038photo_01mips.jpg

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    <DESCRIPTION>GRAPHIC
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