<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2004-07-01</periodOfReport>

    <issuer>
        <issuerCik>0000720896</issuerCik>
        <issuerName>MEMRY CORP</issuerName>
        <issuerTradingSymbol>MRY</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001098536</rptOwnerCik>
            <rptOwnerName>KRUSEN W ANDREW JR</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O DFG MANAGEMENT, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>712 SOUTH OREGON AVE, STE 200</rptOwnerStreet2>
            <rptOwnerCity>TAMPA</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>33606</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2004-07-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1807</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.66</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>108301</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>545700</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>*</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>1.66</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2004-07-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>2710</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.66</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2014-07-01</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2710</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2710</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">These options become exercisable in three equal installments beginning on the first anniversary of the grant date specified in column 3.</footnote>
        <footnote id="F2">WIT Ventures Ltd. (&quot;WIT&quot;) is the direct owner of these securities.  Mr. Krusen is the President and approximately 50% shareholder of JAWIT (&quot;JAWIT&quot;).  JAWIT is the Managing General Partner of WIT.</footnote>
        <footnote id="F3">W. Andrew Krusen, Jr. is the chairman of the Executive Committee of Dominion Financial Group International LLC (&quot;DFGI LLC&quot;).  In addition, Mr. Krusen indirectly beneficially owns certain outstanding securities of DFGI LLC through WIT Ventures, Ltd.  (&quot;WIT&quot;) and through DFG Management Inc., which has a carried interest in DFGI LLC and of which Mr. Krusen is President and 100% ecconomic owner.  JAWIT Corporation of which Mr. Krusen is President and approximately 50% shareholder is the Managing General Partner of WIT.  Dominion Financial Group, Inc., (&quot;DFG Inc&quot;), of which Mr. Krusen is President and an approximately 50% shareholder, is an investor in WIT.</footnote>
        <footnote id="F4">The aggregate amount of securities reported as being indirectly beneficially owned includes 242,500 shares of Common Stock directly owned by WIT, 8,000 shares of Common Stock directly owned by Krusen-Vogt &amp; Co. (&quot;KVC&quot;), 270,000 shares of Common Stock directly owned by DFGI LLC, and 25,000 shares directly owned by Dominion Capital Management (&quot;DCM&quot;).</footnote>
        <footnote id="F5">Mr. Krusen is a General Partner of KVC.  DFG Inc. is the Managing General Partner of DCM.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Marcy Macdonald attorney-in-fact</signatureName>
        <signatureDate>2004-07-01</signatureDate>
    </ownerSignature>
</ownershipDocument>

