Kōsaidō Shuppan

Kōsaidō Shuppan (株式会社廣済堂出版) is a Japanese publishing company headquartered in Kanda-Jinbōchō, Chiyoda-ku, Tokyo. It was established in April 1970 as a spin-off from the then Sakurai Kōsaidō, and has since built a catalogue spanning self-help and psychology, essays, practical hobbies, travel guides, health and lifestyle, literature, baseball and other sports, as well as bunko, shinsho, and mook formats. The company's official website lists genres including liberal arts, science, self-development and psychology, essays, practical hobbies, travel guides, healthy living, literature, baseball, other sports, paperback libraries, new books, and mooks. It also sells online, for example the Japanese cuisine encyclopedia 'Nihon Ryōri Taizen'. The modern corporate history of Kōsaidō Shuppan is closely tied to the wider Kōsaidō group. In October 2008, it merged with Akatsuki Kyōiku Tosho, with the surviving entity renamed Kōsaidō Akatsuki Co., Ltd. (now Akatsuki Kyōiku Tosho). After the merger, the company operated two divisions: a publishing division handling general-interest magazines and books, and an educational publishing division inherited from Akatsuki Kyōiku Tosho. The name 'Kōsaidō Shuppan' continued as a trade name for the publishing division. In October 2011, the publishing division was spun off to form the current Kōsaidō Shuppan Co., Ltd. In September 2019, the parent company Kōsaidō sold all shares of Kōsaidō Shuppan to an unnamed Japanese individual, later reported to be Kazuhiko Nishi. In May 2021, all shares of Kōsaidō Akatsuki (now Akatsuki Kyōiku Tosho) were also transferred to an individual, marking the Kōsaidō group's withdrawal from the publishing business. In May 2025, Kōsaidō Shuppan joined the E-BOND Group, centered on E-BOND Holdings Co., Ltd. Today, Kōsaidō Shuppan continues to publish under imprints such as Kōsaidō Books, Kōsaidō Bunko, Kōsaidō Shinsho, Kōsaidō Family Shinsho, and Health Jin Shinsho, and mook labels including W! and Kōsaidō Best Mook. Its output includes the long-running baseball magazine 'Home Run' (revived in 2008) and the feng shui series by Dr. Copa. The company also engages in planning, editing, production, and sales of electronic publications, DVDs, and CDs, and handles import/export of these products.

Kōsaidō Shuppan was established in April 1970 as a spin-off from the then Sakurai Kōsaidō. Even after the separation, the Kōsaidō head office sometimes handled publishing operations. In September 1995, the then Kōsaidō Printing acquired all shares, making Kōsaidō Shuppan a wholly owned subsidiary. On October 1, 2008, Kōsaidō Shuppan merged with Akatsuki Kyōiku Tosho, with Akatsuki Kyōiku Tosho as the surviving company, and the entity was renamed Kōsaidō Akatsuki Co., Ltd. (now Akatsuki Kyōiku Tosho). After the merger, the company operated two divisions: a publishing division handling general-interest magazines and books, and an educational publishing division inherited from Akatsuki Kyōiku Tosho, dealing with school library materials and educational books. The name 'Kōsaidō Shuppan' continued as a trade name for the publishing division. The publishing division also released video software and distributed digital content. In July 2009, the headquarters moved to Shiba, Minato-ku, Tokyo. In October 2011, the publishing division was spun off and the current Kōsaidō Shuppan Co., Ltd. was established. On September 30, 2019, the parent company Kōsaidō sold all shares of Kōsaidō Shuppan to an unnamed Japanese individual, later reported to be Kazuhiko Nishi. On May 14, 2021, all shares of Kōsaidō Akatsuki (now Akatsuki Kyōiku Tosho) were also transferred to an individual, completing the Kōsaidō group's withdrawal from the publishing business. In May 2025, Kōsaidō Shuppan joined the E-BOND Group, centered on E-BOND Holdings Co., Ltd. Throughout its history, Kōsaidō Shuppan has published numerous magazines and book series. Notable past publications include the crossword magazine 'Crossword House' (launched 1985, suspended May 2010 issue), 'Net Money' (published May 2006 to November 2010), 'Biz Style' (five issues in 2008), 'Yakyū Tarō' (formerly 'Yakyū Kozō', transferred from Byakuya Shobō in 2012), and 'Home Run' (published by Nihon Sports Publishing from 1977 to 2007, revived by Kōsaidō Shuppan in 2008, moved to Mirai Kanai in July 2021). Book labels have included Kōsaidō Books, Kōsaidō Bunko, Kōsaidō Shinsho, Kōsaidō Family Shinsho, and Health Jin Shinsho. Mook labels include W! and Kōsaidō Best Mook. The company also produced the Kōsaidō Video Book series from 1992 to 1999 and digital content such as 'Yondoko!' (launched November 2008, ended November 30, 2010) and 'Kōsaidō Yomimono Web' (launched December 1, 2010).

• Established as a book and magazine publishing and sales company, spun off from Sakurai Kōsaidō.

• Kōsaidō Printing acquires all shares, making Kōsaidō Shuppan a wholly owned subsidiary.

• Magazine 'Home Run' begins publication.

• Merges with Akatsuki Kyōiku Tosho to form Kōsaidō Akatsuki Co., Ltd.

• Headquarters moves to Shiba, Minato-ku, Tokyo.

• Publishing division spun off to establish Kōsaidō Shuppan Co., Ltd.

• Parent company Kōsaidō sells all shares to an unnamed individual, later reported as Kazuhiko Nishi.

• All shares of Kōsaidō Akatsuki transferred to an individual, completing Kōsaidō group's withdrawal from publishing.

• Joins the E-BOND Group, centered on E-BOND Holdings Co., Ltd.

General-interest and practical publisher with strengths in sports, self-help, and hobby genres, operating as a subsidiary within the E-BOND Group.

• Kōsaidō Books

  Book label under Kōsaidō Shuppan.

• Kōsaidō Bunko

  Paperback library label.

• Kōsaidō Shinsho

  New book (shinsho) label.

• Kōsaidō Family Shinsho

  Family-oriented shinsho label.

• Health Jin Shinsho

  Health-focused shinsho label.

• W!

  Mook label.

• Kōsaidō Best Mook

  Mook label.

• Home Run

  Baseball magazine, revived by Kōsaidō Shuppan in 2008.

• Dr. Copa feng shui series

  Feng shui books and magazines by Dr. Copa, sometimes issued as part of Kōsaidō Best Mook.

1. 1廣済堂出版 公式サイトkosaido-pub.co.jp
2. 2会社概要 | 廣済堂出版kosaido-pub.co.jp
3. 3廣済堂出版 - Wikipediaja.wikipedia.org
4. 4Kōsaidō Shuppan - Wikidatawikidata.org