Stores in Asakusa, Tokyo一覧

400 years have passed since sweet potatoes first came to Japan. It has been familiar among ordinary people since Edo period, and said to have saved many people’s lives during famine. Nutrient-rich, as it contains a lot of

vitamin, which people today tend to lack, mineral and dietary fiber, it is truly a healthy food. Hoping many people to enjoy such sweet potatoes, the sweet potato wholesaler "Kawako Shoten" (est. 1876) opened sweet potato confectionery "Asakusa Oimoyasan Koushin" in 1984. With the motto "To pursue 'deliciousness’ made from safe and secure ingredients that can be identified by their suppliers" and the knowhow we have cultivated, we use quality ingredients which we have carefully selected with suppliers and our farm from all over Japan. Having trialed again and again, we manufacture and offer sweet potato confectionery such as candied sweet potatoes, sweet potato tart, and sweet potato paste until today. With the increasing awareness for food, we will make further efforts to produce safer and more secure products.

〈Corporate Philosophy〉

  1. Suppliers, distributors and manufacturers all together create environment for offering safe, secure and better-quality products.
  2. We shall offer products or services which can satisfy everyone.
  3. We shall contribute to make better society with sweet potatoes which have once saved many people’s lives during famine.
  4. We shall support suppliers to sustain prices which can help them continue their supply.


1876 (Meiji 9) Founder Koheiji Saito (age 20) left his farmlands to sharecroppers and established the sweet potato wholesaler "Kawako Shoten" in Komagata, Okawabata along the Sumida River where they can use riverboat from Kawagoe, in order to help sweet potato farmers.
The name "Kawako Shoten" means "Koheiji's store who comes from Kawagoe."
1883 (Meiji 16) Allowed to join the union of sweet potato wholesaler in Tokyo.
912 (Meiji 45 / Taisho 0) The name of the era changed to Taisho
1923 (Taisho 12) Three-story wooden retail store was built that was rare at that time. The Great Kanto Earthquake hit three months later and burned the retail and the distribution departments. Despite of the huge damages, it was reconstructed.
1926 (Taisho 15 / Showa 0) The name of the era changed to Showa.
1935 (Showa 10) Expanded with 12 branches.
1945 (Showa 20) World War 2 and Great Tokyo Air Raid hit the head office and the house.
1955 (Showa 30) Naoe the second (age 53) became the chairman of the union of sweet potato wholesaler in Tokyo.
1981 (Showa 56) The name of the wholesaler changed from "Kawako Shoten" to "Kawako Shoten Co., Ltd."
1983 (Showa 58) The five-story head office of Kawako Shoten Co., Ltd. was built.
1984 (Showa 59) Started retail section of Kawako Shoten Co., Ltd. which was the beginning of Oimoyasan Koushin.
1985 (Showa 60) Opened the very first store of sweet potato confectionery Oimoyasan "Koushin" in Komagata, Taito-ku.
1988 (Showa 63) Changed the store name to "Oimoyasan"
1995 (Heisei 7) "Oimoyasan" was registered as trademark. Today runs 13 directly-owned stores.

Corporate Overview

Company Name Kawako Shoten Co., Ltd.
Store Name Oimoyasan / Oimoyasan Koushin
Head Office 2-1-26, Komagata, Taito-ku, Tokyo 111-0043
TEL (Retail Section): 03-3842-8522
FAX: 03-3844-6964
CEO Kouichi Saito
Date Established 1876 (Meiji 9)
Employees 75 (including part-timers)
Our Business Wholesale of sweet potatoes and sweet potato products /Manufacturing sweet potato confectionary and retail (Asakusa Oimoyasan Koushin)

Brand / Related Company


Oimoyasan Koushin

Related Company:

Miyabi Co., Ltd.