Seishinsha

Seishinsha Co., Ltd. (株式会社正進社) is a Japanese educational publisher founded in 1953 by Shin Kobayashi, a former mathematics teacher. The company began by publishing a mathematics problem book for junior high schools and grew into a comprehensive publisher of supplementary teaching materials for elementary schools, junior high schools, and cram schools (juku). Its headquarters are in Bunkyo, Tokyo. Seishinsha's product range includes workbooks, tests, drills, reference collections, songbooks, and digital materials. The company states that its books are used by roughly three junior high school students per capita nationwide. In recent years it has expanded into digital teaching materials for teachers and students, including browser apps, Google Forms/Excel integrations, videos, and e-books. The company operates through several divisions: elementary school materials, junior high school materials, cram school materials, and academic ability diagnostic tests and mock exams for junior high school students. It also runs workshops for teachers and provides support for children requiring special educational needs, as well as donating materials to developing countries. Seishinsha remains a private company. Its current president is Hajime Kanai, who took office in 2022. The company celebrated its 50th anniversary in 2003 and continues to adapt to changes in education, including the shift toward digital learning.

Seishinsha was founded in 1953 by Shin Kobayashi, who left his career as a mathematics teacher to establish the company in Omagari (present-day Koraku, Bunkyo, Tokyo). The company's first publication was a mathematics problem book for junior high schools. In its early days, with only two employees, the company visited schools almost daily to gather feedback from teachers and improve its materials. In 1958, the headquarters moved to Kojimachi (Yonbancho, Chiyoda). Around 1965, the company began distributing sample copies to junior high schools through agencies. In 1966, the headquarters moved to Sekiguchi (present-day Sekiguchi 1-14-12, Bunkyo). In 1967, a high school division was established, but around 1968 the company faced difficult times due to a reduction in entrance exam subjects. In 1970, the high school division became independent as "Seikosha." In 1979, the current headquarters building was completed at Sekiguchi 1-17-8, Bunkyo. By this time, the company had expanded from being known primarily as "Seishinsha of mathematics" to publishing materials for all subjects in junior high schools. In 1980, Hayami Ito became president. In 1993, Shinji Kobayashi became president. In 1999, the elementary school division was established. In 2003, the company celebrated its 50th anniversary and established a new logistics center. In 2022, Hajime Kanai became president. Today, Seishinsha publishes a wide range of supplementary materials for elementary and junior high schools, as well as for cram schools, and offers academic ability diagnostic tests and mock exams. It has also expanded into digital materials, including browser apps, Google Forms/Excel integrations, videos, and e-books. The company engages in educational contributions such as teacher workshops, special needs support, and donating materials to developing countries.

• 2022

  Hajime Kanai becomes president.

• 2003

  Celebrates 50th anniversary; new logistics center established.

• 1999

  Elementary school division established.

• 1993

  Shinji Kobayashi becomes president.

• 1980

  Hayami Ito becomes president.

• 1979

  Current headquarters building completed at Sekiguchi 1-17-8, Bunkyo.

• 1970

  High school division becomes independent as "Seikosha."

• 1967

  High school division established.

• 1966

  Headquarters moved to Sekiguchi (present-day Sekiguchi 1-14-12, Bunkyo).

• 1965

  Begins distributing sample copies to junior high schools through agencies.

• 1958

  Headquarters moved to Kojimachi (Yonbancho, Chiyoda).

• 1953

  Founded by Shin Kobayashi in Omagari (present-day Koraku, Bunkyo, Tokyo); publishes first mathematics problem book for junior high schools.

A long-established publisher of supplementary educational materials for elementary and junior high schools, known for close ties to school teachers and a broad catalog covering all subjects.

• Junior high school workbooks

• Junior high school tests

• Junior high school drills

• Junior high school reference collections

• Junior high school songbooks

• Elementary school work tests

• Elementary school reference collections

• Elementary school songbooks

• Cram school year-round materials

• Cram school exam preparation workbooks

• Academic ability diagnostic tests and mock exams

• Digital teaching materials (browser apps, Google Forms/Excel integrations, videos, e-books)

1. 1株式会社正進社 教育図書教材の出版seishinsha.co.jp
2. 2会社案内｜株式会社正進社seishinsha.co.jp
3. 3正進社 - Wikipediaja.wikipedia.org
4. 4Seishinsha - Wikidatawikidata.org