FORM 6-K
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                        REPORT OF FOREIGN PRIVATE ISSUER

      Notice of Takeover Bid for Shares of Overseas Petroleum Corporation


                        PURSUANT TO RULE 13a-16 OR 15d-16
                     OF THE SECURITIES EXCHANGE ACT OF 1934


For the month of  January 25, 2005
                 ------------------- 


Commission File Number      09929
                       --------------


                               MITSUI & CO., LTD.
             --------------------------------------------------------
                 (Translation of registrant's name into English)


             2-1, OHTEMACHI 1-CHOME CHIYODA-KU, TOKYO 100-0004  JAPAN
             --------------------------------------------------------
                    (Address of principal executive offices)


Indicate by check mark whether the registrant files or will file annual reports
under cover of Form 20-F or Form 40-F:

                       Form 20-F  [X]     Form 40-F  [ ]

Indicate by check mark if the registrant is submitting the Form 6-K in paper as
permitted by Regulation S-T Rule 101(b)(1): ____

Note: Regulation S-T Rule 101(b)(1) only permits the submission in paper of a
Form 6-K if submitted solely to provide an attached annual report to security
holders.

Indicate by check mark if the registrant is submitting the Form 6-K in paper as
permitted by Regulation S-T Rule 101(b)(7): ____

Note: Regulation S-T Rule 101(b)(7) only permits the submission in paper of a
Form 6-K if submitted to furnish a report or other document that the registrant
foreign private issuer must furnish and make public under the laws of the
jurisdiction in which the registrant is incorporated, domiciled or legally
organized (the registrant's "home country"), or under the rules of the home
country exchange on which the registrant's securities are traded, as long as the
report or other document is not a press release, is not required to be and has
not been distributed to the registrant's security holders, and, if discussing a
material event, has already been the subject of a Form 6-K submission or other
Commission filing on EDGAR.


Indicate by check mark whether by furnishing the information contained in this
Form, the registrant is also thereby furnishing the information to the
Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

                              Yes  [ ]     No  [X] 

If "Yes" is marked, indicate below the file number assigned to the registrant in
connection with Rule 12g3-2(b): 82- ____________


                                   SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned, thereunto duly authorized.


Date: January 25, 2005

                                            MITSUI & CO., LTD.


                                            By: /s/ Tasuku Kondo
                                                --------------------------------
                                                Name:  Tasuku Kondo
                                                Title: Executive Director
                                                       Executive Vice President
                                                       Chief Financial Officer


                                                                January 25, 2005
                                                               Mitsui & Co., Ltd

For Immediate Release
To whom it may concern

      Notice of Takeover Bid for Shares of Overseas Petroleum Corporation

Mitsui & Co., Ltd. (Mitsui) is pleased to announce that it has decided to
acquire shares of Overseas Petroleum Corporation ("OPC") through a takeover bid
("TOB").

1.   PURPOSE OF THE TOB

The purpose of the TOB is to reinforce Mitsui's energy business by acquiring
OPC's shares through a friendly takeover. 

Mitsui will not set the maximum number of shares to be purchased through the TOB
because Mitsui ultimately aims to acquire 100% share of OPC. However, the TOB
will become null and void if Mitsui is not able to obtain 66.67% including its
currently held 2.23% share.

If the TOB is successful and Mitsui is able to acquire sufficient number of
shares to control OPC, Mitsui will be actively involving itself in the decision
to increase OPC's efficiency and further develop its assets. Mitsui also plans
to send its staff to take the position of managing director, director and
auditor within OPC in order to achieve these goals.

2.   OUTLINE OF THE TOB

     1)   The outline of the Target Company

          Name:                    Overseas Petroleum Corporation

          Location:                Tokyo, Japan

          Main Business:           Acquiring oil and natural gas interests, 
                                   investing in E&P and development, and 
                                   providing services for crude oil sales

          Date of Establishment:   March, 1970

          Paid-in Capital:         32,016 million yen (as of end of 
                                   September, 2004)

          Major Shareholders and Percentage of Shares Held:

              Japan Energy Corporation               7.72%
              Idemitsu Kosan Company Limited         6.34%
              Mizuho Corporate Bank                  4.99%

          Relationship between Mitsui and OPC:

          1.   Capital relationship:
               Mitsui holds 2.23% (1,426,316 shares) of the total number of 
               shares outstanding as of end of January 25, 2005. 

          2.   Personnel relationship:
               One director is sent from Mitsui.

          3.   Trading relationship:
               None

     2)   Type of Stock to be purchased: Common stock


     3)   Duration of the TOB:
          From January 26, 2005 to February 21, 2005 (27 days)

     4)   TOB price: 60 yen per share

     5)   Basis of Calculation for the TOB price:
          The TOB price is based on the evaluation of OPC's asset value and
          future cash flow gained through due diligence. 

     6)   Number of Shares to be purchased:
          41,261,684 up to 62,605,684 shares. The TOB will become null and void
          if Mitsui is not able to purchase more than 41,261,684.

     7)   Number of shares held by Mitsui before and after the TOB:

          1.   Before the TOB: 1,426,316 (2.23% of total)

          2.   After the TOB: 42,688,000 up to 64,032,000 shares (66.67% up to
               100%)

     8)   Fund required for the TOB:
          Approximately 2.5 billion yen up to 3.8 billion yen

3.   AGREEMENT BETWEEN OPC AND MITSUI

     OPC has expressed its support for the TOB.

4.   EFFECT ON MITSUI'S CONSOLIDATED RESULTS OF OPERATIONS

     As a result of the TOB, OPC will become a subsidiary of Mitsui. Mitsui
     expects that the effect on the consolidated results of operations for the
     year ending March 31, 2005 is immaterial.


                                        FOR FURTHER INFORMATION, PLEASE CONTACT
                                        MITSUI & CO., LTD.
                                           Corporate Communications Division
                                                  Tel: +81-3-3285-7564
                                              Investor Relations Division
                                                  Tel: +81-3-3285-7910


Disclaimer

This document is created for the purpose of making a general public announcement
regarding the TOB and is not intended to solicit offers for sale. If
shareholders are considering selling their investments, we request that the
shareholders read our offer documents. The shareholders should make their own
independent decision regarding the TOB.

The TOB is not to be effected, whether directly or indirectly, within the United
States of America nor is it aimed at the public in the United States of America,
nor will any of United States mail, interstate commerce or international
commerce systems/methods (including, but not limited to, telephone, telex,
facsimile, e-mail or internet) be used in relation to the TOB and moreover, the
TOB may not be effected via any stock exchange facilities within the United
States of America. We cannot accept responses made using the above-mentioned
systems, methods or facilities or those made from within the United States of
America.