<SUBMISSION>
<ACCESSION-NUMBER>0001110803-05-000052
<TYPE>3
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20050606
<FILING-DATE>20050607
<DATE-OF-FILING-DATE-CHANGE>20050607
<ISSUER>
<COMPANY-DATA>
<CONFORMED-NAME>ILLUMINA INC
<CIK>0001110803
<ASSIGNED-SIC>3826
<IRS-NUMBER>330804655
<STATE-OF-INCORPORATION>CA
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<BUSINESS-ADDRESS>
<STREET1>9885 TOWNE CENTRE DRIVE
<STREET2>.
<CITY>SAN DIEGO
<STATE>CA
<ZIP>92121
<PHONE>8582024500
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>9885 TOWN CENTRE DRIVE
<STREET2>.
<CITY>SAN DIEGO
<STATE>CA
<ZIP>92121
</MAIL-ADDRESS>
</ISSUER>
<REPORTING-OWNER>
<OWNER-DATA>
<CONFORMED-NAME>HENRY CHRISTIAN O
<CIK>0001263805
</OWNER-DATA>
<FILING-VALUES>
<FORM-TYPE>3
<ACT>34
<FILE-NUMBER>000-30361
<FILM-NUMBER>05883779
</FILING-VALUES>
<MAIL-ADDRESS>
<STREET1>555 KANTON BLVD
<STREET2>11TH FL
<CITY>COSTA MESA
<STATE>CA
<ZIP>92626
</MAIL-ADDRESS>
</REPORTING-OWNER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>edgardoc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2005-06-06</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001110803</issuerCik>
        <issuerName>ILLUMINA INC</issuerName>
        <issuerTradingSymbol>ILMN</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001263805</rptOwnerCik>
            <rptOwnerName>HENRY CHRISTIAN O</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>555 KANTON BLVD</rptOwnerStreet1>
            <rptOwnerStreet2>11TH FL</rptOwnerStreet2>
            <rptOwnerCity>COSTA MESA</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92626</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>CFO, VP Finance</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <ownerSignature>
        <signatureName>Christian Henry</signatureName>
        <signatureDate>2005-06-07</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SUBMISSION>
