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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 WSGEwi5uaskXn3rNRXjTw4kQrRqR+Y7YPGoeC0WRmEiamG0HMkcTCOTvn+g1thEA
 1yg1BYT2HciMaN7N3tI+xw==

<SEC-DOCUMENT>0001065239-05-000006.txt : 20050411
<SEC-HEADER>0001065239-05-000006.hdr.sgml : 20050411
<ACCEPTANCE-DATETIME>20050411170128
ACCESSION NUMBER:		0001065239-05-000006
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050407
FILED AS OF DATE:		20050411
DATE AS OF CHANGE:		20050411

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SONIC CORP
		CENTRAL INDEX KEY:			0000868611
		STANDARD INDUSTRIAL CLASSIFICATION:	RETAIL-EATING PLACES [5812]
		IRS NUMBER:				731371046
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0831

	BUSINESS ADDRESS:	
		STREET 1:		300 JOHNNY BENCH DRIVE
		CITY:			OKLAHOMA CITY
		STATE:			OK
		ZIP:			73104
		BUSINESS PHONE:		4052255000

	MAIL ADDRESS:	
		STREET 1:		300 JOHNNY BENCH DRIVE
		STREET 2:		4TH FLOOR
		CITY:			OKLAHOMA CITY
		STATE:			OK
		ZIP:			73104

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			HUDSON J CLIFFORD
		CENTRAL INDEX KEY:			0001065239
		STANDARD INDUSTRIAL CLASSIFICATION:	RETAIL-EATING PLACES [5812]

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-18859
		FILM NUMBER:		05744508

	BUSINESS ADDRESS:	
		STREET 1:		101 PARK AVENUE
		STREET 2:		STE 1400
		CITY:			OKLAHOMA CITY
		STATE:			OK
		ZIP:			73102-7202
		BUSINESS PHONE:		4052807654

	MAIL ADDRESS:	
		STREET 1:		101 PARK AVE
		STREET 2:		14TH FLOOR
		CITY:			OKLAHOMA CITY
		STATE:			OK
		ZIP:			73102
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>hudson040605_ex.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-04-07</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000868611</issuerCik>
        <issuerName>SONIC CORP</issuerName>
        <issuerTradingSymbol>SONC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001065239</rptOwnerCik>
            <rptOwnerName>HUDSON J CLIFFORD</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>300 JOHNNY BENCH DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>OKLAHOMA CITY</rptOwnerCity>
            <rptOwnerState>OK</rptOwnerState>
            <rptOwnerZipCode>73104</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chairman, CEO and President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>32.48</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2005-04-07</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>30051</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>32.48</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2008-04-07</value>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2015-04-07</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>30051</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>30051</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">One-third of the options vest on each of the first three anniversary dates following the date of grant.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Ronald L. Matlock for J. Clifford Hudson</signatureName>
        <signatureDate>2005-04-11</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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