    <SEC-DOCUMENT>0001193125-18-212827-index.html : 20180705
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    <ACCEPTANCE-DATETIME>20180705104608
    ACCESSION NUMBER:		0001193125-18-212827
    CONFORMED SUBMISSION TYPE:	N-CSR
    PUBLIC DOCUMENT COUNT:		23
    CONFORMED PERIOD OF REPORT:	20180430
    FILED AS OF DATE:		20180705
    DATE AS OF CHANGE:		20180705
    EFFECTIVENESS DATE:		20180705

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST, INC.
    		CENTRAL INDEX KEY:			0000894242
    		IRS NUMBER:				133690436
    		STATE OF INCORPORATION:			MD
    		FISCAL YEAR END:			1031

    	FILING VALUES:
    		FORM TYPE:		N-CSR
    		SEC ACT:		1940 Act
    		SEC FILE NUMBER:	811-07354
    		FILM NUMBER:		18939771

    	BUSINESS ADDRESS:
    		STREET 1:		100 BELLEVUE PARKWAY
    		STREET 2:		MUTUAL FUND DEPARTMENT
    		CITY:			WILMINGTON
    		STATE:			DE
    		ZIP:			19809
    		BUSINESS PHONE:		888-825-2257

    	MAIL ADDRESS:
    		STREET 1:		100 BELLEVUE PARKWAY
    		STREET 2:		MUTUAL FUND DEPARTMENT
    		CITY:			WILMINGTON
    		STATE:			DE
    		ZIP:			19809

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC.
    		DATE OF NAME CHANGE:	20121009

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST, INC.
    		DATE OF NAME CHANGE:	20120921

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC
    		DATE OF NAME CHANGE:	19930328
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>N-CSR
    <SEQUENCE>1
    <FILENAME>d549271dncsr.htm
    <DESCRIPTION>BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC.
    <TEXT>
    Document 1 - file: d549271dncsr.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CERT
    <SEQUENCE>2
    <FILENAME>d549271dex99cert.htm
    <DESCRIPTION>CERTIFICATIONS PURSUANT TO SECTION 302
    <TEXT>
    Document 2 - file: d549271dex99cert.htm

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    <DOCUMENT>
    <TYPE>EX-99.906CERT
    <SEQUENCE>3
    <FILENAME>d549271dex99906cert.htm
    <DESCRIPTION>CERTIFICATIONS PURSUANT TO SECTION 906
    <TEXT>
    Document 3 - file: d549271dex99906cert.htm

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    <TYPE>EX-99.PROXY.POL
    <SEQUENCE>4
    <FILENAME>d549271dex99proxypol.htm
    <DESCRIPTION>CLOSED-END FUND PROXY VOTING POLICY
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    Document 4 - file: d549271dex99proxypol.htm

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    <TYPE>EX-99.CORP.GOV
    <SEQUENCE>5
    <FILENAME>d549271dex99corpgov.htm
    <DESCRIPTION>GLOBAL CORPORATE GOVERNANCE AND ENGAGEMENT PRINCIPALS
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    Document 5 - file: d549271dex99corpgov.htm

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    <DESCRIPTION>GRAPHIC
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    Document 8 - file: g549271g54u61.jpg

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    Document 9 - file: g549271g55e73.jpg

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    Document 10 - file: g549271g65b16.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 11 - file: g549271g67v66.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 12 - file: g549271g76v81.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 13 - file: g549271g81p33.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 14 - file: g549271g90e97.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 15 - file: g549271g91u77.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 17 - file: g549271g96r49.jpg

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    <SEQUENCE>18
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    <DESCRIPTION>GRAPHIC
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    Document 18 - file: g549271g97u39.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 19 - file: g549271g98s48.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 20 - file: g549271g98u13.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 22 - file: g573420photo_01mips.jpg

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