<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0101</schemaVersion>

    <documentType>4</documentType><periodOfReport>2003-05-23</periodOfReport>
    <issuer>
        <issuerCik>0000089800</issuerCik>
        <issuerName>SHERWIN WILLIAMS CO</issuerName>
        <issuerTradingSymbol>SHW</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId>
            <rptOwnerCik>0001203526</rptOwnerCik>
            <rptOwnerName>SCAMINACE JOSEPH M</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>  </rptOwnerStreet1>
            <rptOwnerStreet2>  </rptOwnerStreet2>
            <rptOwnerCity>  </rptOwnerCity>
            <rptOwnerState>  </rptOwnerState>
            <rptOwnerZipCode>  </rptOwnerZipCode>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>1</isDirector><isOfficer>1</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther><officerTitle>President and COO</officerTitle></reportingOwnerRelationship></reportingOwner><derivativeSecurity><securityTitle><value>Phantom Stock Units</value><footnoteId id="F1"/></securityTitle><conversionOrExercisePrice><value>9.78</value></conversionOrExercisePrice><transactionDate><value>2003-05-23</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>A</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>241.56</value></transactionShares><transactionValue><value>9.78</value></transactionValue><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><exerciseDate><value>1988-08-08</value><footnoteId id="F1"/></exerciseDate><expirationDate><value>1988-08-08</value><footnoteId id="F1"/></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>0</value><footnoteId id="F1"/></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>104339.57</value><footnoteId id="F2"/></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value></value></natureOfOwnership></ownershipNature></derivativeSecurity><footnotes><footnote id="F1">Acquisition of phantom stock units (in an exempt transaction) under deferred compensation plan(s) to be settled generally upon the Reporting Person's retirement or termination of employment, subject to diversification provisions of the plan(s).  The plan(s) utilize unit accounting, with phantom stock units consisting primarily of phantom shares of common stock and a small percentage of short-term investments.  On April 1, 1997, units were assigned a beginning per unit price of $10.00.</footnote><footnote id="F2">Includes phantom stock units acquired pursuant to the dividend equivalent reinvestment feature of the plan(s).</footnote></footnotes><ownerSignature><signatureName>Louis E. Stellato, Attorney-in-fact</signatureName><signatureDate>2003-05-27</signatureDate></ownerSignature></ownershipDocument>

