Itsukishobo
Corporate brand
UnclaimedOsaka-based educational publisher and test provider best known for the Itsuki mock examinations for junior-high and high-school entrance exams in the Kansai region.
Last updated September 28, 2026
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Overview
Itsukishobo (株式会社五ツ木書房) is a Japanese educational publisher and testing company headquartered in Tsurumi-ku, Osaka. Founded in 1956 in Nishi-ku, Osaka, the company has built its business around two pillars: school teaching materials and tests, and the Itsuki mock examinations (五ツ木模試) for junior-high and high-school entrance exams. Its flagship offering, the Itsuki mock examination, is described by the company as the largest open-venue mock examination in the Kansai region, taken each year by large numbers of fifth- and sixth-grade elementary students and junior-high students. The company's product range includes school textbooks and tests, the Selett 21 series of study materials for junior-high and high-school students, library materials for junior-high schools, psychological testing, and the operation of the cram school Seminar Itsuki (セミナー五ツ木). It also publishes entrance-exam information and runs guidance-counselling events for students and parents. Its sales area covers Osaka, Kyoto, Hyogo, Shiga, Nara, Wakayama, and the city of Nabari in Mie Prefecture. Itsukishobo's mock examinations are organized into several lines: the Itsuki Mock Examination for junior-high students, the Itsuki-Kyoto Mock Examination specialized for Kyoto high-school entrance exams, and the Itsuki-Senshodo Mock Examination for elementary-school students aiming at private junior-high entrance. The company has continued to modernize delivery, offering at-home testing systems and online portals for registration, score viewing, and follow-up study advice. Itsukishobo remains a private, family-style Japanese company rather than a listed corporation. Its long-standing corporate motto, "Sincere, humble, and diligent" (誠実に、謙虚に、一生懸命に), reflects its positioning as a trusted regional education brand. The current president is Kawamura Masataka (河村匡剛).
History
Itsukishobo was founded in 1956 as a limited company in Utsubohonmachi, Nishi-ku, Osaka. It moved to Awabori-dori in Nishi-ku in 1959. In 1960 it launched the 'Junior 1 and 2 Academic Ability Test' (中1・2年学力テスト会), followed in 1962 by the 'Junior 3 Mock Test' (中3年模擬テスト会). In 1963 the company built and moved into a new office in Imagafuku-naka, Joto-ku, Osaka, and introduced computer processing for academic evaluation. It established the Itsuki Education Research Institute in 1964. In 1968 it introduced printing equipment and adopted deviation scores (hensachi) for academic evaluation. In 1974 it opened the cram school 'Seminar Itsuki' (セミナー五ツ木). In 1977 it created a self-diagnostic learning materials division for home study. In 1981 it built and moved into a new office in Yokozutsumi, Tsurumi-ku, Osaka, and introduced a host computer. In 1990 it joined the Japan Textbook and Teaching Materials Association, the Teaching Materials Research Center, and the National Textbook and Teaching Materials Sales Council. In 1996 it held its first high-school guidance fair. It launched its website in 1999. In 2000, it took over the junior-high entrance mock examination business from Senshodo, which had gone bankrupt that year, and held the first Itsuki-Senshodo Junior High Entrance Academic Ability Test. It also held its first junior-high guidance fair and introduced an internet ticketing system for mock test outlets. In 2001 the Junior 1 and 2 Academic Ability Test was renamed the 'Junior 1 and 2 Standard Test'. In 2008 it held the first Itsuki-Kitaoji High School Entrance Mock Examination, which was renamed the 'Itsuki-Kyoto Mock Test' in 2009. The company continues to operate from its Osaka headquarters, providing mock examinations, school materials, and entrance-exam information.
- 2009
Renamed the Itsuki-Kitaoji High School Entrance Mock Examination to 'Itsuki-Kyoto Mock Test'.
- 2008
Held the first Itsuki-Kitaoji High School Entrance Mock Examination.
- 2001
Renamed the Junior 1 and 2 Academic Ability Test to 'Junior 1 and 2 Standard Test'.
- 2000
Took over the junior-high entrance mock examination business from the bankrupt Senshodo; held the first Itsuki-Senshodo Junior High Entrance Academic Ability Test; held the first junior-high guidance fair; introduced an internet ticketing system.
- 1999
Launched its website.
- 1996
Held the first high-school guidance fair.
- 1990
Joined the Japan Textbook and Teaching Materials Association, the Teaching Materials Research Center, and the National Textbook and Teaching Materials Sales Council.
- 1981
Built and moved into a new office in Yokozutsumi, Tsurumi-ku, Osaka; introduced a host computer.
- 1977
Created the self-diagnostic learning materials division for home study.
- 1974
Opened the cram school 'Seminar Itsuki'.
Products and positioning
Regional Kansai education brand known for large-scale open-venue mock examinations and school teaching materials.
Itsuki Mock Examination (五ツ木模試)
Large-scale open-venue mock examination for junior-high students in the Kansai region.
Itsuki-Kyoto Mock Examination (五ツ木・京都模試)
Mock examination specialized for Kyoto high-school entrance exams.
Itsuki-Senshodo Mock Examination (五ツ木・駸々堂模試)
Mock examination for elementary-school students aiming at private junior-high entrance.
Selett 21 series
Study materials for junior-high and high-school students.
School textbooks and tests
Textbooks and tests for junior-high schools.
Psychological testing
Psychological testing services.
Seminar Itsuki
Cram school operated by Itsukishobo.
Sources5 sources
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