-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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<SEC-DOCUMENT>0000840467-04-000253.txt : 20041129
<SEC-HEADER>0000840467-04-000253.hdr.sgml : 20041129
<ACCEPTANCE-DATETIME>20041129164313
ACCESSION NUMBER:		0000840467-04-000253
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20041124
FILED AS OF DATE:		20041129
DATE AS OF CHANGE:		20041129

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BOGHOSIAN ROBERT A
		CENTRAL INDEX KEY:			0001231169

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-10109
		FILM NUMBER:		041172099

	MAIL ADDRESS:	
		STREET 1:		4300 N HARBOR BLVD
		CITY:			FULLERTON
		STATE:			CA
		ZIP:			92834-3100

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BECKMAN COULTER INC
		CENTRAL INDEX KEY:			0000840467
		STANDARD INDUSTRIAL CLASSIFICATION:	LABORATORY ANALYTICAL INSTRUMENTS [3826]
		IRS NUMBER:				951040600
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		4300 N HARBOR BLVD
		STREET 2:		PO BOX 3100
		CITY:			FULLERTON
		STATE:			CA
		ZIP:			92834-3100
		BUSINESS PHONE:		7147736907

	MAIL ADDRESS:	
		STREET 1:		4300 N HARBOR BLVD
		STREET 2:		PO BOX 3100
		CITY:			FULLERTON
		STATE:			CA
		ZIP:			92834-3100

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BECKMAN INSTRUMENTS INC
		DATE OF NAME CHANGE:	19920703
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
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        <issuerName>BECKMAN COULTER INC</issuerName>
        <issuerTradingSymbol>BEC</issuerTradingSymbol>
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            <rptOwnerName>BOGHOSIAN ROBERT A</rptOwnerName>
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            <rptOwnerStreet1>4300 N HARBOR BLVD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
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            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92834-3100</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>VP Quality and Regulatory</officerTitle>
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                <transactionCode>M</transactionCode>
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                    <value>300</value>
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                <directOrIndirectOwnership>
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        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
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            <transactionDate>
                <value>2004-11-24</value>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
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            <transactionAmounts>
                <transactionShares>
                    <value>300</value>
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                <transactionPricePerShare>
                    <value>65.92</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>311.571</value>
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                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Non-Qualified Stock Option</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>34.565</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2004-11-24</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>6250</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2013-04-01</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>6250</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>18750</value>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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    </derivativeTable>

    <footnotes>
        <footnote id="F1">Stock option granted under the Beckman Coulter, Inc. 1998 Incentive Compensation Plan. This derivative security is 25% exercisable one year after the date of grant, 50% exercisable two years after the date of grant, 75% exercisable three years after the date of grant and 100% exercisable four years after the date of grant.  This stock option award expires ten years from the date of grant.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>William H. May, by Power of Attorney</signatureName>
        <signatureDate>2004-11-29</signatureDate>
    </ownerSignature>
</ownershipDocument>

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</TEXT>
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</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----