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Issunbou Co.,Ltd.

Issunbou Co., Ltd. is a licensed first-class architectural design firm headquartered in Sapporo, Japan, providing architectural design services including aesthetic, structural, and mechanical design, as well as steel fabrication drawings, BIM/CIM, civil engineering design, and surveying. The company serves general contractors, housing manufacturers, construction consultants, trading companies, and fabricators as its primary clients. Leveraging overseas branches in Myanmar, Kyrgyzstan, and Nepal, as well as a subsidiary in Dalian, China, the firm offers cost-competitive design and drafting services with an international delivery capability.

Market Cap
¥—B
EV
¥—B
US$1 = ¥156.80 (2026-10-23)
LTM EV/EBITDA
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LTM EV/EBIT
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LTM PER
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No price data
Stock data unavailable
This company is listed on TOKYO PRO Market (TPM), a market limited to professional investors with very low secondary-market liquidity. Continuous stock price information is not formed, so price, market cap, and EV-based multiples are not available. Financial data from public filings (P&L, BS, directors, etc.) remains accurate for analysis if disclosed.
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Performance & Balance
Revenue 5Y (¥B)
1.18US$7.54M'25/71.17US$7.44M'26/7
Net Income 5Y (¥B)
0.02US$0.13M'25/70.01US$0.07M'26/7
Shareholders
Top 10 hold 97.2%
as of 2025-07-31 · Source: Annual Securities Report
1
Kamiyama Co., Ltd.
61.51%
2
Tetsumasa KAMIYAMA
24.85%
3
Hokyo SDGs Promotion Investment Limited Partnership
4.38%
4
Santo Co., Ltd.
3.02%
5
Masashi SEO
0.76%
6
Chuo Chiken Co., Ltd.
0.72%
7
Hiroyuki KAWAHARA
0.70%
8
Toshifumi ONUMA
0.43%
9
Tsujino Kensetsu Kogyo Co., Ltd.
0.42%
10
Seiichi GOTO
0.40%
Management
7 officers
Tetsumasa KAMIYAMA
Representative Director, President
Apr. 1987 Joined Satsuei Kogyo Ltd.; Jul. 1990 Founded Mount Up Co., Ltd., appointed Representative Director; Jul. 1993 Founded personal architectural design practice; Aug. 2005 Founded the Company, appointed Representative Director; Jul. 2006 Resigned as Representative Director of the Company; Aug. 2008 Re-appointed Representative Director of the Company (current); Apr. 2018 Founded Kamiyama Co., Ltd., appointed Representative Director (current); Jan. 2019 Founded Dalian Yicunfang Design Co., Ltd., appointed Chairman; Mar. 2019 Founded Issunbo Consul Co., Ltd., appointed Representative Director; Mar. 2023 Resigned as Chairman of Dalian Yicunfang Design Co., Ltd.
1962-01-21
Akihisa FURUTA
Director, Senior Managing Executive Officer
Apr. 1984 Joined Sokushin Co., Ltd.; Apr. 1986 Joined Ministry of Posts and Telecommunications; Jul. 1988 Joined Nihon Typewriter Co., Ltd. (now Canon Semiconductor Equipment Co., Ltd.); Jun. 1997 Founded Shin Design Kobo Ltd., appointed Managing Director; Dec. 1998 Joined Christ Advan Co., Ltd.; May 2002 Founded Lucifer Co., Ltd., appointed Representative Director; Feb. 2015 Joined the Company; Aug. 2016 Appointed Director of the Company; Jun. 2019 Appointed Director of Issunbo Consul Co., Ltd.; Aug. 2019 Appointed Executive Managing Director of the Company (current)
1962-03-09
Hideto NAKAYAMA
Director
Apr. 1971 Joined Kajima Corporation; Apr. 1973 Joined Shimafuji Construction Industry Co., Ltd.; Nov. 1979 Appointed Director of Senshin Architectural Design Co., Ltd.; Apr. 1985 Joined Kobayashi Co., Ltd.; Apr. 1988 Appointed Director of Ishida Komuten Co., Ltd.; Mar. 1993 Joined Sasaki Construction Co., Ltd.; Apr. 1994 Appointed Director of the same company; May 1998 Joined Sankenetsu Co., Ltd.; May 1998 Appointed Director of Settle Ltd.; Sep. 2000 Founded Arc Giken Co., Ltd., appointed Representative Director; Mar. 2021 Appointed Director of the Company (current)
1950-11-17
Seiichi GOTO
Director
Apr. 1988 Joined Nikko Securities Co., Ltd. (now SMBC Nikko Securities Inc.); May 1989 Joined Nihon LCA Co., Ltd.; Apr. 1992 Appointed Sapporo Branch Manager of the same company; Jun. 1993 Founded S&S Network Co., Ltd., appointed Managing Director; Jul. 1995 Appointed Representative Director & President of the same company; Jul. 2003 Appointed Representative Director & Chairman of the same company (current); Nov. 2004 Appointed Representative Director & President of Kankyo Kiki Service Ltd. (current); Jan. 2011 Appointed Statutory Auditor of Hokkaido Needs Co., Ltd.; Aug. 2016 Appointed Director of the Company (current)
1964-01-26
Kenichi YASUI
Audit & Supervisory Board Member (Full-time)
Apr. 1994 Joined Cowboy Co., Ltd.; Jun. 2006 Joined Round One Co., Ltd.; Jun. 2016 Joined the Company; Aug. 2016 Appointed Statutory Auditor of the Company; Jan. 2018 Resigned as Statutory Auditor of the Company; Aug. 2018 Appointed General Manager, Corporate Planning Division of the Company; Oct. 2019 Appointed Statutory Auditor of the Company (current); Sep. 2020 Appointed Statutory Auditor of Issunbo Consul Co., Ltd.; Mar. 2021 Appointed Supervisor of Dalian Yicunfang Design Co., Ltd.; Mar. 2023 Resigned as Supervisor of Dalian Yicunfang Design Co., Ltd.
1973-10-27
Kosuke MORIMOTO
Audit & Supervisory Board Member
Apr. 1997 Joined Daio Paper Corporation; Jan. 2004 Joined S&S Network Co., Ltd.; Jul. 2014 Appointed General Manager of the same company; Aug. 2016 Appointed Statutory Auditor of the Company (current); Feb. 2024 Founded Crossroad Co., Ltd., appointed Representative Director (current); Apr. 2024 Retired from S&S Network Co., Ltd.
1975-02-09
Hanae OIKAWA
Audit & Supervisory Board Member
Apr. 2007 Entered the Legal Training and Research Institute of the Supreme Court of Japan; Sep. 2008 Registered as Attorney (Sapporo Bar Association), joined Nagata Law Office; Nov. 2016 Joined Kishida Law Office; Apr. 2021 Founded Hiiragi Law Office (current); Oct. 2021 Appointed Statutory Auditor of the Company (current)
1979-11-19
Large Shareholding Reports
No filings
Disclosures
No disclosures
Primary Source Filings
TDnet
2025-10-29
発行者情報
FY ending Jul 2025
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