Jan.1971

Shoji Ishikawa and Katsuyoshi Yamaguchi invested 250,000 yen in the (former) Matsuoka Lumber Sangyo Co., Ltd. material warehouse for the purpose of wholesale plywood made from hardwood from Hokkaido, Established with capital of 500,000 yen and Shoji Ishikawa as the first representative director.
(Former company name: Ishikawa Building Materials)

1972

Increased capital to 2.5 million yen.
Head office relocated to 15 Midori-cho, Asahikawa-shi, Hokkaido

1975

Increased capital to 5 million yen.
Begins processing and sales of lumber, plywood, and lumber products.

1977

Shoji Ishikawa Resigned as Representative Director
Katsuyoshi Yamaguchi 2nd Representative Director

1979

Sapporo Sales Office opened.

1980

Member of Japan Plywood Wholesalers Association

1983

Changed the company name from (former company name) Ishikawa Building Materials to (current company name) KOYOJU Plywood Corporation.
Head office moved to 7-7 Nagayama-cho, Asahikawa, Hokkaido.

1985

Increased capital to 17 million yen.

1991

First-generation "KOYOJU Plywood Business Core System" goes into operation.

1996

Direct trade with overseas shippers begins.

1998

Second-generation "KOYOJU Plywood Business Core System" begins operations.

2000

Completion of a natural wood-based plywood manufacturing plant

2001

Ministry of Land, Infrastructure, Transport and Tourism
Non-combustible material certification (NM-0181) obtained

2002

Sapporo Sales Office upgraded to a branch office.

2003

Low Formaldehyde Natural Wood Laminated Plywood
(JAS-F☆☆☆☆J Certified SPW-No.3/01,Fc) acquired

2004

Increased capital to 25 million yen.

2005

Western Japan Office established in Fuchu City, Hiroshima Prefecture.
Third-generation "KOYOJU plywood business backbone system" goes into operation.

2006

Certified under the Green Purchasing Law (Hokkaido-0004)

2007

Ministry of Land, Infrastructure, Transport and Tourism Non-combustible material certification (NM-1312) obtained

2007

Katsuyoshi Yamaguchi Chairman of the Board of Directors
Hironari Yamaguchi III, Representative Director, assumed office

2011

Opened Kanto Office.
Address and head office functions moved to Higashitakasu Higashi 2jo 2-chome, Asahikawa City

2013

Introduced a defined contribution pension plan (Japanese version of 401k).

2014

Solar Power Generation Starts at Sapporo Branch

2015

Solar Power Generation Begins in Soma City, Fukushima Prefecture.
Solar Power Generation Begins at Asahikawa Headquarters.

2016

Solar power generation begins operating in Aomori City, Aomori Prefecture.

2019

Solar Power Generation Begins in Kushiro City.
Introduced the CENTATEQ P-110 CNC machining center manufactured by HOMAG of Germany at the Kanto Plant.

2021

Renewal of Corporate Website.
EDGTEQ S-500 edgebander manufactured by HOMAG of Germany introduced at Kanto Plant

2022

First batch of foreign (Indonesian) technical intern trainees hired.
Kanto Plant introduces "SAWTEQ B-300" running saw manufactured by HOMAG of Germany.
Introduced "PAQTEQ C-250" custom-made corrugated cardboard cutting machine
Introduced "iX" 3D CAD CAM program automatic processing data generation system.

2023

Signing Ceremony for the "Mt.Oyako-no Mori Hokkaido Corporate Forestation" activity agreement with the Town of Touma
Commercialization of "giraffenap," The world's first nap box that allows you to sleep standing up like a giraffe.
Second batch of foreign (Indonesian) technical intern trainees hired.