6-K

FORM 6-K

SECURITIES AND EXCHANGE COMMISSION

450, 5th Street

Washington, D.C. 20549

REPORT OF FOREIGN PRIVATE ISSUER

Pursuant to Rule 13a-16 or 15d-16 of

the Securities Exchange Act of 1934

For the month of August, 2006

Daiichi Sankyo Company, Limited

(Translation of registrant’s name into English)

5-1, Nihonbashi 3-chome

Chuo-ku, Tokyo 103-8426

Japan

(Address of principal executive offices)

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

Form 20-F  þ            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):

Yes  ¨            No  þ

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):

Yes  ¨            No  þ

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

Yes  ¨            No  þ

If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): N/A

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.

	DAIICHI SANKYO COMPANY, LIMITED
DATE: August 3, 2006	By:	/s/ Takashi Shoda
	Name:	Takashi Shoda
	Title:	President and Representative Director

EXHIBIT INDEX

Exhibit Number		Description of Exhibit
99.1	—	Press Release: “Sales of Antihypertensive Agent Olmetec ® Begin in China”

EX-99.1

Exhibit 99.1

For Immediate Release

Company name: DAIICHI SANKYO COMPANY, LIMITED

Representative: Takashi Shoda, President and Representative Director

(Code no.: 4568, First Section, Tokyo, Osaka and Nagoya Stock Exchanges)

Please address inquiries to Toshio Takahashi, Corporate Officer in Charge,

Corporate Communications Department

Telephone: +81-3-6225-1126

http://www.daiichisankyo.co.jp/

Sales of Antihypertensive Agent Olmetec^® Begin in China

Tokyo, August 2, 2006 – Shanghai Sankyo Pharmaceuticals Co., Ltd., the Chinese subsidiary of Sankyo Co., Ltd. (a subsidiary of DAIICHI SANKYO COMPANY, LIMITED) acquired permission in April 2006 from the Chinese SFDA (State Food Drug Administration) to manufacture the antihypertensive agent Olmetec^® (generic name: olmesartan medoxomil) and began selling the drug in China in July.

Olmetec^® tablets possess strong antihypertensive action compared with other ARBs (angiotensin II receptor blockers). As a best-in-class ARB, the drug is expected to achieve superior results in preventing end-organ damage. Until now, the drug has exhibited superior antihypertensive action in multiple double-blind comparative studies conducted in various countries. We are confident that the drug will greatly contribute to the treatment of hypertension in China.

Olmesartan medoxomil is antihypertension medication developed by Sankyo. The drug was launched in the US in May 2002 (US brand name, Benicar^®), and is now being sold in more than 35 countries around the world. (Japanese and European brand name, Olmetec^®). DAIICHI SANKYO Group is expected to achieve global sales of approximately 150 billion yen for FY 2006.

About Shanghai Sankyo Pharmaceuticals Co., Ltd.

Established: November 1999

Capital: $53 million

Business type: Joint business with Shanghai Zhangjiang Hi-Tech Park Development Co., Ltd.

Current product lineup: Mevalotin^® tablets, Loxonin^® tablets, Banan^® tablets, Asmeton^® capsules

Future product lines: Olmesartan tablets, Banan^® dry syrup, Kremezin^® granules

Number of employees: 381 (148 medical representatives) as of the end of December 2005