<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType><periodOfReport>2004-01-22</periodOfReport>
    <issuer>
        <issuerCik>0000200406</issuerCik>
        <issuerName>JOHNSON &amp; JOHNSON</issuerName>
        <issuerTradingSymbol>JNJ</issuerTradingSymbol></issuer><reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001189008</rptOwnerCik>
            <rptOwnerName>GOGGINS COLLEEN A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>JOHNSON &amp; JOHNSON</rptOwnerStreet1>
            <rptOwnerStreet2>ONE JOHNSON &amp; JOHNSON PLAZA</rptOwnerStreet2>
            <rptOwnerCity>NEW BRUNSWICK</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>08933</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>0</isDirector><isOfficer>1</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther><officerTitle>Member, Executive Committee</officerTitle></reportingOwnerRelationship></reportingOwner><nonDerivativeTable><nonDerivativeTransaction><securityTitle><value>Common</value></securityTitle><transactionDate><value>2004-01-22</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>M</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>6400</value></transactionShares><transactionPricePerShare><value>13.41</value><footnoteId id="F1"/></transactionPricePerShare><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>84609</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></nonDerivativeTransaction><nonDerivativeTransaction><securityTitle><value>Common</value></securityTitle><transactionDate><value>2004-01-22</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>S</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>6400</value></transactionShares><transactionPricePerShare><value>53.02</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>78209</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></nonDerivativeTransaction><nonDerivativeHolding><securityTitle><value>Common</value><footnoteId id="F2"/></securityTitle><postTransactionAmounts><sharesOwnedFollowingTransaction><value>952</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>401(k) and ESOP Savings Plans</value></natureOfOwnership></ownershipNature></nonDerivativeHolding></nonDerivativeTable><derivativeTable><derivativeHolding><securityTitle><value>Phantom Stock Units</value></securityTitle><conversionOrExercisePrice><value>0</value><footnoteId id="F3"/></conversionOrExercisePrice><exerciseDate><footnoteId id="F4"/></exerciseDate><expirationDate><footnoteId id="F4"/></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common</value></underlyingSecurityTitle><underlyingSecurityShares><footnoteId id="F4"/></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>2945</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding><derivativeTransaction><securityTitle><value>Employee Stock Option (Right to Buy)</value><footnoteId id="F5"/></securityTitle><conversionOrExercisePrice><value>13.41</value><footnoteId id="F1"/></conversionOrExercisePrice><transactionDate><value>2004-01-22</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>M</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>6400</value></transactionShares><transactionPricePerShare><value>13.41</value><footnoteId id="F1"/></transactionPricePerShare><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><exerciseDate><value>1996-12-01</value></exerciseDate><expirationDate><value>2004-12-01</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common</value></underlyingSecurityTitle><underlyingSecurityShares><value>6400</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>0</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeTransaction></derivativeTable><footnotes><footnote id="F1">Adjusted to reflect two-for-one stock splits in 1996 and 2001.</footnote><footnote id="F2">Shares held under Johnson &amp; Johnson's 401(k) and ESOP Savings Plans at Plan's most recent reporting date (12/31/2003).</footnote><footnote id="F3">The Phantom Stock converts into common stock on a one-for-one basis.</footnote><footnote id="F4">The Phantom Stock Units held under the Issuer's Executive Income Deferral Plan as of December 31, 2003 are to be settled in cash upon the Reporting Person's Retirement.</footnote><footnote id="F5">Awarded under Issuer's Stock Option Plan and exercisable in increments of 20% per year  starting two years from date of grant.</footnote></footnotes><remarks/><ownerSignature><signatureName>M. H. Ullmann, Attorney in Fact for C. A. Goggins</signatureName><signatureDate>2004-01-23</signatureDate></ownerSignature></ownershipDocument>

