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

    <documentType>3</documentType><periodOfReport>2003-11-14</periodOfReport>
    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000769874</issuerCik>
        <issuerName>REMEC INC</issuerName>
        <issuerTradingSymbol>REMC</issuerTradingSymbol></issuer><reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001245444</rptOwnerCik>
            <rptOwnerName>HICKMAN WINSTON E</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>3790 VIA DE LA VALLE, SUITE 311</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>DEL MAR</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92014</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>0</isDirector><isOfficer>1</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther><officerTitle>Chief Financial Officer</officerTitle></reportingOwnerRelationship></reportingOwner><nonDerivativeTable><nonDerivativeHolding><securityTitle><value>Common Stock</value></securityTitle><postTransactionAmounts><sharesOwnedFollowingTransaction><value>2063</value><footnoteId id="F1"/></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>By Hickman Trust dtd 10/07/96</value></natureOfOwnership></ownershipNature></nonDerivativeHolding><nonDerivativeHolding><securityTitle><value>Common Stock</value></securityTitle><postTransactionAmounts><sharesOwnedFollowingTransaction><value>344</value><footnoteId id="F2"/></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>By David W. Hickman Trust</value></natureOfOwnership></ownershipNature></nonDerivativeHolding><nonDerivativeHolding><securityTitle><value>Common Stock</value></securityTitle><postTransactionAmounts><sharesOwnedFollowingTransaction><value>344</value><footnoteId id="F3"/></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>By Winston Marc Hickman Trust</value></natureOfOwnership></ownershipNature></nonDerivativeHolding></nonDerivativeTable><derivativeTable><derivativeHolding><securityTitle><value>Common Stock (Right to Buy)</value></securityTitle><conversionOrExercisePrice><value>12.05</value></conversionOrExercisePrice><exerciseDate><footnoteId id="F4"/></exerciseDate><expirationDate><value>2012-11-14</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>100000</value></underlyingSecurityShares></underlyingSecurity><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeHolding></derivativeTable><footnotes><footnote id="F1">The reporting person acquired 2,063 shares of REMEC common stock in exchange for his interest in Paradigm Wireless Systems, Inc. (Paradigm) pursuant to Paradigm's merger into a subsidiary of REMEC.  The merger agreement, which was entered into on November 10, 2003, placed a value on REMEC's common stock of $12.67 a share, it's closing price on November 6, 2003.  Of the 2,063 shares issued to the reporting person in the merger, 740 shares are currently being held in escrow and are subject to forfeiture during the 18-month period following the merger to satisfy claims arising as a result of Paradigm's breach of any representations and warranties in the merger agreement.</footnote><footnote id="F2">The reporting person acquired 344 shares of REMEC common stock in exchange for his interest in Paradigm Wireless Systems, Inc. (Paradigm) pursuant to Paradigm's merger into a subsidiary of REMEC.  The merger agreement, which was entered into on November 10, 2003, placed a value on REMEC's common stock of $12.67 a share, it's closing price on November 6, 2003.  Of the 344 shares issued to the reporting person in the merger, 123 shares are currently being held in escrow and are subject to forfeiture during the 18-month period following the merger to satisfy claims arising as a result of Paradigm's breach of any representations and warranties in the merger agreement.</footnote><footnote id="F3">The reporting person acquired 344 shares of REMEC common stock in exchange for his interest in Paradigm Wireless Systems, Inc. (Paradigm) pursuant to Paradigm's merger into a subsidiary of REMEC.  The merger agreement, which was entered into on November 10, 2003, placed a value on REMEC's common stock of $12.67 a share, it's closing price on November 6, 2003.  Of the 344 shares issued to the reporting person in the merger, 123 shares are currently being held in escrow and are subject to forfeiture during the 18-month period following the merger to satisfy claims arising as a result of Paradigm's breach of any representations and warranties in the merger agreement.</footnote><footnote id="F4">This Option vests 25% each year for 4 years.</footnote></footnotes><remarks/><ownerSignature><signatureName>Winston E. Hickman</signatureName><signatureDate>2003-11-21</signatureDate></ownerSignature></ownershipDocument>

