-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 BCrIcNC1n2NA8m2HnoyYI18A7jNiojxPplWejZi1nxQCW3VS7CpZu1mV7TEXdXYF
 fGw8lcdimB8GStF5pCRxAw==

<SEC-DOCUMENT>0000950142-03-001524.txt : 20030905
<SEC-HEADER>0000950142-03-001524.hdr.sgml : 20030905
<ACCEPTANCE-DATETIME>20030905190847
ACCESSION NUMBER:		0000950142-03-001524
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030904
FILED AS OF DATE:		20030905

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MITSUBISHI TOKYO FINANCIAL GROUP INC
		CENTRAL INDEX KEY:			0000067088
		STANDARD INDUSTRIAL CLASSIFICATION:	UNKNOWN SIC - 8880 [8880]
		FISCAL YEAR END:			0331

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-15081
		FILM NUMBER:		03884781

	BUSINESS ADDRESS:	
		STREET 1:		4-1 MARUNOUCHI 2-CHOME
		STREET 2:		CHIYODA-KU
		CITY:			TOKYO 100-6326
		STATE:			M0
		ZIP:			00000
		BUSINESS PHONE:		2125301784

	MAIL ADDRESS:	
		STREET 1:		48 WALL ST BANK OF NEW YORK
		STREET 2:		C/O J MCSWIGGAN
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10286

	FORMER NAME:	
		FORMER CONFORMED NAME:	BANK OF TOKYO MITSUBISHI LTD /ADR/
		DATE OF NAME CHANGE:	20010402

	FORMER NAME:	
		FORMER CONFORMED NAME:	MITSUBISHI BANK LTD /ADR/
		DATE OF NAME CHANGE:	19920929

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			UNIONBANCAL CORP
		CENTRAL INDEX KEY:			0001011659
		STANDARD INDUSTRIAL CLASSIFICATION:	NATIONAL COMMERCIAL BANKS [6021]
		IRS NUMBER:				941234979
		STATE OF INCORPORATION:			CA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		400 CALIFORNIA STREET
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94104-1476
		BUSINESS PHONE:		4157652969

	MAIL ADDRESS:	
		STREET 1:		400 CALIFORNIA STREET
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94104-1476

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BANK OF TOKYO MITSUBISHI LTD
		CENTRAL INDEX KEY:			0000852743
		STANDARD INDUSTRIAL CLASSIFICATION:	COMMERCIAL BANKS, NEC [6029]
		FISCAL YEAR END:			0331

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-15081
		FILM NUMBER:		03884780

	BUSINESS ADDRESS:	
		STREET 1:		4-1 MARUNOUCHI 2-CHOME
		STREET 2:		CHIYODA-KU
		CITY:			TOKYO 100
		STATE:			M0
		ZIP:			MO 00000
		BUSINESS PHONE:		2127824547

	MAIL ADDRESS:	
		STREET 1:		1251 AVENUE OF THE AMERICAS 15TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10020-1104

	FORMER NAME:	
		FORMER CONFORMED NAME:	MITSUBISHI BANK LTD
		DATE OF NAME CHANGE:	19981209
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>form4_unionbancalex.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<!-- - EDGAR Ease Plus 1.0                                   07/25/03  TT    -->
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType>
   <periodOfReport>2003-09-04</periodOfReport>
   <notSubjectToSection16>0</notSubjectToSection16>
    <issuer>
        <issuerCik>0001011659</issuerCik>
        <issuerName>UNIONBANCAL CORP</issuerName>
        <issuerTradingSymbol>UB</issuerTradingSymbol>
   </issuer>
   <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000067088</rptOwnerCik>
            <rptOwnerName>MITSUBISHI TOKYO FINANCIAL GROUP INC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>4-1 MARUNOUCHI 2-CHOME</rptOwnerStreet1>
            <rptOwnerStreet2>CHIYODA-KU</rptOwnerStreet2>
            <rptOwnerCity>TOKYO 100-6326, JAPAN</rptOwnerCity>
            <rptOwnerState>M0</rptOwnerState>
            <rptOwnerZipCode>00000</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
         <isDirector>0</isDirector>
         <isOfficer>0</isOfficer>
         <isTenPercentOwner>1</isTenPercentOwner>
         <isOther>0</isOther>
      </reportingOwnerRelationship>
   </reportingOwner>
   <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000852743</rptOwnerCik>
            <rptOwnerName>BANK OF TOKYO MITSUBISHI LTD</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1251 AVENUE OF THE AMERICUS</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10020-1104</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
         <isDirector>0</isDirector>
         <isOfficer>0</isOfficer>
         <isTenPercentOwner>1</isTenPercentOwner>
         <isOther>0</isOther>
      </reportingOwnerRelationship>
   </reportingOwner>
 <nonDerivativeTable>
   <nonDerivativeTransaction>
      <securityTitle>
         <value>Common Stock</value>
      </securityTitle>
      <transactionDate>
         <value>2003-09-04</value>
      </transactionDate>
      <transactionCoding>
         <transactionFormType>4</transactionFormType>
         <transactionCode>D</transactionCode>
         <equitySwapInvolved>0</equitySwapInvolved>
      </transactionCoding>
      <transactionAmounts>
         <transactionShares>
           <value>6659267</value>
         </transactionShares>
         <transactionPricePerShare>
           <value>45.05</value>
         </transactionPricePerShare>
         <transactionAcquiredDisposedCode>
           <value>D</value>
         </transactionAcquiredDisposedCode>
      </transactionAmounts>
      <postTransactionAmounts>
         <sharesOwnedFollowingTransaction>
           <value>91732217</value>
         </sharesOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
         <directOrIndirectOwnership>
            <value>I</value>
         </directOrIndirectOwnership>
         <natureOfOwnership>
            <value>See Note 1</value>
            <footnoteId id="F1"/>
         </natureOfOwnership>
      </ownershipNature>
   </nonDerivativeTransaction>
 </nonDerivativeTable>
   <footnotes>
      <footnote id="F1"> Mitsubishi Tokyo Financial Group, Inc. is the sole shareholder of The Bank of Tokyo-Mitsubishi, Ltd., which is the direct beneficial owner of the shares of the issuer.</footnote>
   </footnotes>
   <remarks>Mitsubishi Tokyo Financial Group, Inc.
By: Masaaki Tanaka,General Manager,Corporate Policy Division
The Bank  of Tokyo-Mitsubishi,Ltd.
By: Kyota Omori,Managing Director  and General Manager,Corporate Planning Office</remarks>
   <ownerSignature>
      <signatureName>Masaaki Tanaka, General Manager, Corporate Policy Division</signatureName>
      <signatureDate>2003-09-05</signatureDate>
   </ownerSignature>
   <ownerSignature>
      <signatureName>Kyota Ohmori, Managing Director and General Manager, Corporate Planning Office</signatureName>
      <signatureDate>2003-09-05</signatureDate>
   </ownerSignature>
</ownershipDocument>

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