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News Release

FOR IMMEDIATE RELEASE
November 18, 2004

Notice Concerning the Acquisition of the Company's Own Shares through ToSTNeT-2


Listed Stock Name:   Eisai Co., Ltd.
Director and President & CEO: Mr. Haruo Naito
Headquarters: 4-6-10 Koishikawa Bunkyo-ku, Tokyo
Securities Code: 4523
Listed Locations: First Sections of the Tokyo Stock Exchange
& the Osaka Securities Exchange
Inquiries: Mr. Hiroyuki Mitsui
Corporate Officer
Corporate Communications
Phone 81-3-3817-5085


Notice Concerning the Acquisition of the Company's Own Shares
through ToSTNeT-2

Eisai Co. Ltd. announces the decision on the method of acquisition of own shares in accordance with the Japanese Commercial Code Article 211-3, Clause 1, Item (2). Details are noted below.

I1. Method of Acquisition

Shares will be purchased at the Tokyo Stock Exchange at 8:45 in the morning of November 19, 2004 by a closing price of yen3,090 per share as of today, November 18, 2004. Transactions (closing price transaction) will be made through ToSTNeT-2, and shall not be made by other trading systems nor at another time. The purchase order will be valid only at the time designated for transactions.
 
II2. Contents of the Acquisition

(1) Type of the Share to be AcquiredCommon Stock

(2) Total Number of Shares to be Acquired2 million shares (maximum)

(Note 1) This number is final. Depending on market fluctuations and other factors, a part or all of the transaction may not be performed.
(Note 2) The purchase is to be made by selling orders corresponding to the number of shares planned to be acquired.
III3. Acquisition Disclosure

When the purchase has been completed at 8:45 on November 19, 2004, the result of the transaction will be disclosed.

(Reference)
The resolution related to the acquisition of the Company's shares at the meeting of the Board of Directors held on July 30, 2004.

• Type of the Share to be Acquired Common Stock

• Total Number of Shares to be Acquired 5 million shares (maximum)

• Total Value of Shares to be Acquired yen15 billion (maximum)

Total number of shares acquired on or after the date of the meeting of the Board of Directors held on July 30, 2004 as of November 18, 2004.

• Total Number of Shares Acquired 0

• Total Value of Shares Acquired yen0