-----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,
 B2G9+mY6oLT0GlbHeJyhd+AyMl2zYqS9OtIwgFR0auw1me8jV7TC3xhz5073xeLG
 IHh7Lfq+OmNZrmtkTyNu0Q==

<SEC-DOCUMENT>0001179110-03-002250.txt : 20030624
<SEC-HEADER>0001179110-03-002250.hdr.sgml : 20030624
<ACCEPTANCE-DATETIME>20030624141132
ACCESSION NUMBER:		0001179110-03-002250
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030623
FILED AS OF DATE:		20030624

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			LONDON MICHAEL
		CENTRAL INDEX KEY:			0001191194

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-09595
		FILM NUMBER:		03754899

	MAIL ADDRESS:	
		STREET 1:		C/O BEST BUY INC
		STREET 2:		7075 FLYING CLOUD DR
		CITY:			EDEN PRAIRIE
		STATE:			MN
		ZIP:			55344

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BEST BUY CO INC
		CENTRAL INDEX KEY:			0000764478
		STANDARD INDUSTRIAL CLASSIFICATION:	RETAIL-RADIO TV & CONSUMER ELECTRONICS STORES [5731]
		IRS NUMBER:				410907483
		STATE OF INCORPORATION:			MN
		FISCAL YEAR END:			0301

	BUSINESS ADDRESS:	
		STREET 1:		7601 PENN AVE SOUTH
		CITY:			RICHFIELD
		STATE:			MN
		ZIP:			55423
		BUSINESS PHONE:		6122911000

	MAIL ADDRESS:	
		STREET 1:		7601 PENN AVE SOUTH
		CITY:			RICHFIELD
		STATE:			MN
		ZIP:			55423

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BEST BUYS CO INC
		DATE OF NAME CHANGE:	19900809
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 4 -2003-06-23
<TEXT>
<XML>
<?xml version="1.0"?><ownershipDocument><schemaVersion>X0101</schemaVersion>    <documentType>4</documentType><periodOfReport>2003-06-23</periodOfReport><notSubjectToSection16>0</notSubjectToSection16><issuer><issuerCik>0000764478</issuerCik><issuerName>BEST BUY CO INC</issuerName>        <issuerTradingSymbol>BBY</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId><rptOwnerCik>0001191194</rptOwnerCik><rptOwnerName>LONDON MICHAEL</rptOwnerName></reportingOwnerId><reportingOwnerAddress><rptOwnerStreet1>  </rptOwnerStreet1><rptOwnerStreet2>  </rptOwnerStreet2><rptOwnerCity>  </rptOwnerCity><rptOwnerState>  </rptOwnerState><rptOwnerZipCode>  </rptOwnerZipCode></reportingOwnerAddress><reportingOwnerRelationship><isDirector>0</isDirector><isOfficer>1</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther><officerTitle>EVP - General Merchandise Mgr.</officerTitle><otherText></otherText></reportingOwnerRelationship></reportingOwner><nonDerivativeSecurity><securityTitle><value>Common Stock
</value></securityTitle><transactionDate><value>2003-06-23</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>M</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>30000</value></transactionShares><transactionValue><value>11.46</value></transactionValue><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>43890</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></nonDerivativeSecurity><nonDerivativeSecurity><securityTitle><value>Common Stock</value></securityTitle><transactionDate><value>2003-06-23</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><trans
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></ownershipNature></nonDerivativeSecurity><nonDerivativeSecurity><securityTitle><value>Common Stock</value></securityTitle><transactionDate><value>2003-06-23</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>S</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>2900</value></transactionShares><transactionValue><value>42.76</value></transactionValue><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>25890</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></nonDerivativeSecurity><nonDerivativeSecurity><securityTitle><value>Common Stock</value></securityTitle><transactionDate><value>2003-0
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><value></value></transactionTimeliness><transactionAmounts><transactionShares><value>1000</value></transactionShares><transactionValue><value>42.80</value></transactionValue><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>13890</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></nonDerivativeSecurity><derivativeSecurity><securityTitle><value>Stock Option (Right to Buy)</value></securityTitle><conversionOrExercisePrice><value>11.46</value></conversionOrExercisePrice><transactionDate><value>2003-06-23</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>M</transactionCode><equitySwapInvolved>false</equitySwapInvolved></transactionCoding><transactionTimeliness><value></value></transactionTimeliness><transactionAmounts><tr
ansactionShares><value>30000</value></transactionShares><transactionValue><value>0</value></transactionValue><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><exerciseDate><value>1998-04-24</value></exerciseDate><expirationDate><value>2008-04-23</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>30000</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>33750</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership></ownershipNature></derivativeSecurity><footnotes></footnotes><ownerSignature><signatureName>/s/ Mark Geldernick</signatureName><signatureDate>2003-06-23</signatureDate></ownerSignature></ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----