-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 J/B7cknIN40X8E6v+l0Csbs7X/YttPdF6GXOMcmktbJI27mW8aRdJB71mFCb5EHn
 9UPx3bsjUa0KtQhQCVjZdQ==

<SEC-DOCUMENT>0001283946-04-000001.txt : 20040614
<SEC-HEADER>0001283946-04-000001.hdr.sgml : 20040611
<ACCEPTANCE-DATETIME>20040614101621
ACCESSION NUMBER:		0001283946-04-000001
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20040323
FILED AS OF DATE:		20040614

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			AVALLONE MICHAEL N
		CENTRAL INDEX KEY:			0001283946

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-21615
		FILM NUMBER:		04859973

	MAIL ADDRESS:	
		STREET 1:		4 MANCHESTER DR
		CITY:			WRENTHAM
		STATE:			MA
		ZIP:			02093

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BOSTON BIOMEDICA INC
		CENTRAL INDEX KEY:			0000830656
		STANDARD INDUSTRIAL CLASSIFICATION:	IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES [2835]
		IRS NUMBER:				042652826
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		375 WEST STREET
		CITY:			WEST BRIDGEWATER
		STATE:			MA
		ZIP:			02379
		BUSINESS PHONE:		5085801900

	MAIL ADDRESS:	
		STREET 1:		375 WEST ST
		CITY:			WEST BRIDGEWATER
		STATE:			MA
		ZIP:			02379
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2004-03-23</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000830656</issuerCik>
        <issuerName>BOSTON BIOMEDICA INC</issuerName>
        <issuerTradingSymbol>BBII</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001283946</rptOwnerCik>
            <rptOwnerName>AVALLONE MICHAEL N</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>4 MANCHESTER DR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>WRENTHAM</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02093</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>CFO and VP, Finance</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>2.54</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2004-03-23</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>5000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2005-03-23</value>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2014-03-23</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>5000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>22500</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">These options vest in four equal quarterly installments on an annual basis commencing 03-23-2005</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Michael N. Avallone</signatureName>
        <signatureDate>2004-06-14</signatureDate>
    </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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