Tokiwa Kogyo Co., Ltd.
Japanese civil engineering and asphalt paving contractor founded in 1947, headquartered in Chiyoda-ku, Tokyo, building roads, expressways, airports and other infrastructure across Japan.
Last updated September 27, 2026
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Overview
Tokiwa Kogyo Co., Ltd. (常盤工業株式会社) is a Japanese civil engineering and road-paving contractor headquartered at 4-2-38 Kudan-kita, Chiyoda-ku, Tokyo. The company was founded on 1 February 1947, originally established in Nihonbashi-Hongokucho, Chuo-ku, Tokyo, with initial capital of 195,000 yen. Its core business is the survey, planning, design, construction and supervision of civil engineering and building works, together with the manufacture and sale of asphalt mixtures and asphalt emulsions. It also engages in land development, real estate, vehicle maintenance, industrial waste treatment, and the import, sale, rental and repair of construction machinery. The company's self-described corporate philosophy is "Engineering for the Future" (未来へのエンジニアリング), under which it states that it has participated since 1947 in infrastructure projects including the Tomei Expressway, national highways and airport construction across Japan. Its stated basic concept is to create new environments with new technology, extending from general civil engineering and building into sports facilities and special construction. Tokiwa Kogyo operates through a nationwide branch network. According to its company profile, its offices include the Tohoku, Kanto, Tokyo, Suwa, Chubu, Hokuriku, Osaka, Hiroshima and Kyushu branches. It holds a Ministry of Land, Infrastructure, Transport and Tourism construction business permit (Tokku-4 No. 2289) and a first-class architect office registration with the Tokyo Metropolitan Government (No. 35432). The company reports 267 employees and capital of 100 million yen, and states that it has obtained ISO 9001:2015, ISO 14001:2015 and ISO 45001:2018 certifications. Tokiwa Kogyo is a private company. Its history page records capital increases through the decades — from 195,000 yen at founding to 100 million yen in 1966, 200 million yen in 1970, 350 million yen in 1987, 365 million yen in 1992, 410 million yen in 1996 and 450 million yen in 1997 — followed by a capital reduction to 100 million yen in 2007. It formed a capital and business alliance with Road Industry Co., Ltd. (道路工業株式会社) in 2006, issued 700 million yen of preferred shares in 2009, and absorbed Toyo Land Techno Co., Ltd. in 2011. Ken Saito became president in 2019. The company maintains a group of affiliated construction firms and continues to publish annual financial announcements, most recently its 84th term (fiscal year ended March 2026).
History
Tokiwa Kogyo Co., Ltd. was founded on 1 February 1947, with its head office established at 4-3 Nihonbashi-Hongokucho, Chuo-ku, Tokyo, and initial capital of 195,000 yen. In 1950 it set up the Shinjuku sales office (today's Tokyo branch). In 1953 it filed its first construction contractor registration application and established the Chiba office (today's Chiba sales office). It reached 100 million yen in sales in 1955. In 1957 it established the Suwa office (today's Suwa branch) and the Sumida asphalt mixture plant, and in 1959 the Osaka office (today's Osaka branch). In 1961 the head office building was newly constructed and relocated to its current address at 4-2-38 Kudan-kita, Chiyoda-ku. In 1962, in preparation for works related to the Tokyo Olympics, the company pushed forward with mechanization of construction. In 1963 it established the Kashiwa plant (now affiliated company Tokiwa Construction Co., Ltd.), and in 1965 the Sakai plant, while carrying out paving works for the Third Keihin Road ordered by the Japan Highway Public Corporation. Capital was increased to 100 million yen in 1966. In 1967 the Mitaka office (today's Nishi-Tokyo sales office) was established, and in 1969 the asphalt materials department (today's asphalt mixture department), the Nagoya office (today's Chubu branch) and the Saitama office (today's Saitama sales office) were set up. Capital rose to 200 million yen in 1970. During the 1970s the company expanded its branch network: the Sendai office (today's Tohoku branch) in 1971, the Hiroshima office (today's Hiroshima branch) in 1972, the Ibaraki office in 1974, the Shizuoka office in 1976, and the building department (today's construction division) and Fukuoka office (today's Kyushu branch) in 1978. In 1979 it established a technical research institute and reached 100 million yen... in fact 10 billion yen-scale sales of 100 hundred million yen (100億円). In 1987 sales exceeded 20.9 billion yen and capital was increased to 350 million yen. Capital rose to 365 million yen in 1992, and sales reached about 33.5 billion yen in 1993. The head office building was rebuilt at the current site in 1995. Capital was increased to 410 million yen in 1996, and in 1997 the company marked its 50th anniversary and raised capital to 450 million yen. In 1999 sales were about 38.6 billion yen, and the Kanto and Tokyo branches obtained ISO 9002 (now ISO 9001) certification. In 2001 ISO 9002 (now ISO 9001) certification was completed at all branches. In 2006 the company concluded a capital and business alliance with Road Industry Co., Ltd. In 2007 capital was reduced to 100 million yen, and company-wide ISO 9001 certification was unified (expanded). In 2009 it issued 700 million yen of preferred shares. In 2011 it absorbed and merged Toyo Land Techno Co., Ltd. In 2013 the company obtained ISO 14001 and OHSAS 18001 certification company-wide. In 2017, as a business continuity measure, it built backup communication lines and installed a backup server at the Hokuriku branch. In 2018 the Chiba sales office was rebuilt and renovated. In 2019 Ken Saito became president; new buildings for the Kanto branch and Saitama sales office were completed and offices relocated; and a new Yokohama sales office was opened under the Tokyo branch. In 2020 the Kanto branch dormitory was completed and opened, the Misato joint asphalt plant office and technical research institute were rebuilt and renovated, and the Kyushu branch relocated. In 2021 the new Suwa branch building was completed and the office relocated. The company continues to operate as a private, family of affiliated construction firms, publishing annual financial announcements; its most recent published announcement covers the 84th term (fiscal year ended March 2026).
- 2001
ISO 9002 (now ISO 9001) certification completed at all branches.
- 1999
Sales about 38.6 billion yen; Kanto and Tokyo branches obtained ISO 9002 certification.
- 1997
50th anniversary; capital increased to 450 million yen.
- 1996
Capital increased to 410 million yen.
- 1995
New head office building constructed at current site.
- 1993
Sales reached about 33.5 billion yen.
- 1992
Capital increased to 365 million yen.
- 1987
Sales exceeded 20.9 billion yen; capital increased to 350 million yen.
- 1979
Established technical research institute; reached 10 billion yen in sales.
- 1978
Established building department and Fukuoka office (today's Kyushu branch).
Products and positioning
A long-established Japanese mid-sized general contractor specializing in asphalt paving and civil engineering infrastructure, with a nationwide branch network and ISO-certified operations.
Asphalt paving works
Paving of roads, expressways and airports, a core business since the 1960s.
Asphalt mixtures and emulsions
Manufacture and sale of asphalt mixtures and asphalt emulsions.
General civil engineering and building works
Survey, planning, design, construction, supervision and contracting of civil engineering and building works.
Land development
Residential land creation and related works.
Real estate
Ownership, sale and leasing of real estate.
Industrial waste treatment
Industrial waste treatment services.
Construction machinery services
Import, sale, brokerage, repair and rental of construction machinery.
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