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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 K6iKej1kaQ3i/dUlC2+SHs95ahnfJQ4eSuPRpqMo9YaaHZa/sHqmI/84HoHvr0RO
 WvZxoK2hWxgwE1J1jwmtnA==

<SEC-DOCUMENT>0000920371-06-000031.txt : 20060620
<SEC-HEADER>0000920371-06-000031.hdr.sgml : 20060620
<ACCEPTANCE-DATETIME>20060620173251
ACCESSION NUMBER:		0000920371-06-000031
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20060612
FILED AS OF DATE:		20060620
DATE AS OF CHANGE:		20060620

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SIMPSON MANUFACTURING CO INC /CA/
		CENTRAL INDEX KEY:			0000920371
		STANDARD INDUSTRIAL CLASSIFICATION:	CUTLERY, HANDTOOLS & GENERAL HARDWARE [3420]
		IRS NUMBER:				943196943
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		4120 DUBLILN BLVD STE 400
		CITY:			DUBLIN
		STATE:			CA
		ZIP:			94568
		BUSINESS PHONE:		9255609000

	MAIL ADDRESS:	
		STREET 1:		4120 DUBLIN BLVD STE 400
		CITY:			DUBLIN
		STATE:			CA
		ZIP:			94568

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			California College of the Arts
		CENTRAL INDEX KEY:			0001366642
		STATE OF INCORPORATION:			CA
		FISCAL YEAR END:			0430

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-13429
		FILM NUMBER:		06915905

	BUSINESS ADDRESS:	
		STREET 1:		5212 BROADWAY
		CITY:			OAKLAND
		STATE:			CA
		ZIP:			95618
		BUSINESS PHONE:		510-594-3600

	MAIL ADDRESS:	
		STREET 1:		5212 BROADWAY
		CITY:			OAKLAND
		STATE:			CA
		ZIP:			95618
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2006-06-12</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000920371</issuerCik>
        <issuerName>SIMPSON MANUFACTURING CO INC /CA/</issuerName>
        <issuerTradingSymbol>NYSE:SSD</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001366642</rptOwnerCik>
            <rptOwnerName>California College of the Arts</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>5212 BROADWAY</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>OAKLAND</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94618</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>(See Note 1 below)</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>57120</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes></footnotes>

    <remarks>Note 1:  Barclay Simpson is a Director, Officer and 10% owner of Simpson Manufacturing Co., Inc. and is a member of the Board of Directors and the Executive Committee of the reporting person.</remarks>

    <ownerSignature>
        <signatureName>David Kirshman</signatureName>
        <signatureDate>2006-06-20</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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