    <SEC-DOCUMENT>0001193125-22-187843-index.html : 20220705
    <SEC-HEADER>0001193125-22-187843.hdr.sgml : 20220705
    <ACCEPTANCE-DATETIME>20220705144403
    ACCESSION NUMBER:		0001193125-22-187843
    CONFORMED SUBMISSION TYPE:	N-CSR
    PUBLIC DOCUMENT COUNT:		19
    CONFORMED PERIOD OF REPORT:	20220430
    FILED AS OF DATE:		20220705
    DATE AS OF CHANGE:		20220705
    EFFECTIVENESS DATE:		20220705

    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:			0430

    	FILING VALUES:
    		FORM TYPE:		N-CSR
    		SEC ACT:		1940 Act
    		SEC FILE NUMBER:	811-07354
    		FILM NUMBER:		221064244

    	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:	20220525

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST, INC.
    		DATE OF NAME CHANGE:	20180130

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC.
    		DATE OF NAME CHANGE:	20121009
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>N-CSR
    <SEQUENCE>1
    <FILENAME>d296837dncsr.htm
    <DESCRIPTION>BLACKROCK INVESTMENT QUALITY MUNICIPAL TRUST INC.
    <TEXT>
    Document 1 - file: d296837dncsr.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CERT
    <SEQUENCE>2
    <FILENAME>d296837dex99cert.htm
    <DESCRIPTION>CERTIFICATIONS PURSUANT TO SECTION 302
    <TEXT>
    Document 2 - file: d296837dex99cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.906 CERT
    <SEQUENCE>3
    <FILENAME>d296837dex99906cert.htm
    <DESCRIPTION>CERTIFICATIONS PURSUANT TO SECTION 906
    <TEXT>
    Document 3 - file: d296837dex99906cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CONSENT
    <SEQUENCE>4
    <FILENAME>d296837dex99consent.htm
    <DESCRIPTION>CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
    <TEXT>
    Document 4 - file: d296837dex99consent.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.PROXYPOL
    <SEQUENCE>5
    <FILENAME>d296837dex99proxypol.htm
    <DESCRIPTION>PROXY VOTING POLICY
    <TEXT>
    Document 5 - file: d296837dex99proxypol.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.GLOBAL.CORP.GO
    <SEQUENCE>6
    <FILENAME>d296837dex99globalcorpgo.htm
    <DESCRIPTION>GLOBAL CORPORATE GOVERNANCE & ENGAGEMENT PRINCIPLES
    <TEXT>
    Document 6 - file: d296837dex99globalcorpgo.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.US.CORP.GOV
    <SEQUENCE>7
    <FILENAME>d296837dex99uscorpgov.htm
    <DESCRIPTION>CORPORATE GOVERNANCE AND PROXY VOTING GUIDELINES FOR U.S. SECURITIES
    <TEXT>
    Document 7 - file: d296837dex99uscorpgov.htm

    </DOCUMENT>
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    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>g296837g12m12.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: g296837g12m12.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>g296837g21b31.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: g296837g21b31.jpg

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    <SEQUENCE>10
    <FILENAME>g296837g3.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: g296837g3.jpg

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    <SEQUENCE>11
    <FILENAME>g296837g33g19.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: g296837g33g19.jpg

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    <SEQUENCE>12
    <FILENAME>g296837g42l24.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: g296837g42l24.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>g296837g44m44.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: g296837g44m44.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>g296837g46a05.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: g296837g46a05.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>g296837g66m66.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: g296837g66m66.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>g296837g99m99.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 16 - file: g296837g99m99.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>g296837leaf.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 17 - file: g296837leaf.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>g296837photo_01mips.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 18 - file: g296837photo_01mips.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>g296837sig_01mips.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 19 - file: g296837sig_01mips.jpg

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