| Kenkyusha Co., Ltd. 株式会社研究社 | |
| Type: | Public (unlisted) |
| Location: | 〒102-8152 Fujimi 2-11-3 Chiyoda, Tokyo, Japan |
| Key People: | Masao Sekido (representative Director), Goichirō Kosakai (founder) |
| Industry: | Publishing |
| Products: | dictionaries |
| Homepage: | kenkyusha.co.jp |
The is a publishing house with headquarters in Chiyoda, Tokyo, Japan. Its product range is centered on foreign language—mainly English—dictionaries and textbooks. The name, Kenkyūsha, can be translated as "study/research company".
The company was founded by Goichirō Kosakai as in 1907 published the first edition of one year later. In 1916 the company's name was changed to its present: Kenkyūsha.
The predecessor of titled was launched in 1917. The company extended its product range in 1918 with the, a large dictionary, compiled by Yoshitarō Takenobu.
Kenkyūsha expands, establishing in 1919 a typesetting workshop on the slope of Kudan, a former street in Chiyoda, Tokyo, and — in 1920 — a printing house on Kagurazaka in Ushigome. In 1921, the first volume of the covering English literature appears. All of the 100 volumes are completed by 1932.
Due to reconstruction, in 1924, the printing house is temporarily moved to Iidamachi. 1927 sees the completion of the printing shop on Kagurazaka. Another press is established in 1939 in Kichijōji, west of central Tokyo. In 1944, Kenkyūsha receives an assignment from Aki Yasutarō for, a monthly magazine aimed at researchers and students of English literature. In the same year, the Japanese scholar Fumio Nakajima publishes .Three years later, the is founded. The printing business is split off in 1951 under the Kenkyūsha Printing Corporation.
In 1963 the company publishes consisting of 12 volumes. A year later, is launched together with the . A year after its 60th anniversary, in 1968, Kenkyūsha publishes in five volumes.
The year 1984 saw big changes for the company. Kenkyūsha Printing built a new office in Nobidome, Niiza in Saitama Prefecture. The Fuji plate-making factory and the Kichijōji factory were moved to the new location and at the printing shop at Kudan, a typesetting factory was established.
Kenkyūsha has been publishing dictionaries in various sizes for almost one hundred years. The following list is a selection of dictionaries published by the company together with the years of publication.
A printer for Kenkyusha Co., Ltd. In 1951-02-01, it became an independent company.