-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 DcAUk6DcoYhHclczpPTX/g==

<SEC-DOCUMENT>0001181431-06-031134.txt : 20060517
<SEC-HEADER>0001181431-06-031134.hdr.sgml : 20060517
<ACCEPTANCE-DATETIME>20060517204659
ACCESSION NUMBER:		0001181431-06-031134
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20060515
FILED AS OF DATE:		20060517
DATE AS OF CHANGE:		20060517

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			OYO GEOSPACE CORP
		CENTRAL INDEX KEY:			0001001115
		STANDARD INDUSTRIAL CLASSIFICATION:	MEASURING & CONTROLLING DEVICES, NEC [3829]
		IRS NUMBER:				760447780
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0930

	BUSINESS ADDRESS:	
		STREET 1:		7007 PINEMONT DR.
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77040
		BUSINESS PHONE:		7139864444

	MAIL ADDRESS:	
		STREET 1:		7007 PINEMONT DR.
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77040

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			OYO CORP
		CENTRAL INDEX KEY:			0001049645

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	333-36727
		FILM NUMBER:		06850397

	BUSINESS ADDRESS:	
		STREET 1:		ICHIGAYA BUILDING 2-6
		STREET 2:		KUDAN-KITE 4 CHOME,CHIODA-KU, TOKYO 102
		CITY:			JAPAN
		STATE:			M0
		ZIP:			00000
		BUSINESS PHONE:		01181332340811

	MAIL ADDRESS:	
		STREET 1:		ICHIGAYA BUILDING 2-6
		STREET 2:		KUDAN-KITE 4 CHOME,CHIYODA-KU, TOKYO 102
		CITY:			JAPAN
		STATE:			M0
		ZIP:			00000
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>rrd118299.xml
<DESCRIPTION>THIRD HALL OPTION EXERCISE
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2006-05-15</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001001115</issuerCik>
        <issuerName>OYO GEOSPACE CORP</issuerName>
        <issuerTradingSymbol>OYOG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001049645</rptOwnerCik>
            <rptOwnerName>OYO CORP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>ICHIGAYA BUILDING 2-6</rptOwnerStreet1>
            <rptOwnerStreet2>KUDAN-KITE 4 CHOME, CHIYODA-KU TOKYO 102</rptOwnerStreet2>
            <rptOwnerCity>JAPAN</rptOwnerCity>
            <rptOwnerState>M0</rptOwnerState>
            <rptOwnerZipCode>00000</rptOwnerZipCode>
            <rptOwnerStateDescription>JAPAN</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, $.01 par value</value>
            </securityTitle>
            <transactionDate>
                <value>2006-05-15</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>X</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>135000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>10.01</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1150000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By OYO Corporation U.S.A.</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Options (obligation to sell)</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>10.01</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2006-05-15</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>X</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>135000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2005-05-31</value>
            </exerciseDate>
            <expirationDate>
                <value>2012-06-28</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>135000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By OYO Corporation U.S.A.</value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Pursuant to a privately negotiated agreement between OYO Corporation U.S.A. and Ernest M. Hall, Jr. dated as of June 28, 2002, OYO Corporation U.S.A. granted Mr. Hall options to purchase 140,000 shares of common stock, par value $.01 per share, of OYO Geospace Corporation held by OYO Corporation U.S.A.  Mr. Hall previously exercised options pursuant to this agreement to purchase 5,000 shares of common stock, par value $.01 per share, of OYO Geospace Corporation held by OYO Corporation U.S.A. on April 3, 2006.  The reported transaction reflects Mr. Hall's exercise of the remaining options pursuant to this agreement for 135,000 shares of common stock, par value $.01 per share, of OYO Geospace Corporation held by OYO Corporation U.S.A.  OYO Geospace Corporation is not a party to this transaction.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Katsuhiko Kobayashi</signatureName>
        <signatureDate>2006-05-18</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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