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News Release

FOR IMMEDIATE RELEASE
November 19, 2004

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

Eisai Co., Ltd. announces the acquisition of own shares made in accordance with the announcement of November 18, 2004. The transaction took place today as detailed below.

I1. Type of the Share Acquired Common Stock
II2. Total Number of Shares Acquired 1,970,000
III3. Purchase Price yen3,090 per share
IV4.Total Amount of Acquisition yen6,087.3 million
V5. Date of Purchase November 19, 2004
VI6. Method of Purchase Through ToSTNeT-2 (closing price transaction) of the Tokyo Stock Exchange

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

(1) Type of the Share to be Acquired Common Stock

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

(3) 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.

(1) Total Number of Shares Acquired 1,970,000

(2) Total Value of Shares Acquired yen6,087.3 million