Taisei Rotech Co., Ltd.

Daikura Kiyaharu established the Daikura Group Trading Company, operating both machinery trade and construction business.

The first electric street lamp (arc lamp) in Japan was erected in front of the Daikura Group Trading Company at 2-chome, Ginza.

Daikura Kiyaharu, upon the command of then Foreign Minister Inoue Kaoru, built the Shikan Garan.

Separated the civil engineering division from Okura Group Trading Company and established Japan Civil Engineering Co., Ltd. (the first construction industry corporation).

Established Okura Group Co., Ltd. (the first construction industry corporation).

Carried out the company's first road paving project between Hanzomon and Kojimachi 3-chome in Tokyo.

Renamed the company to Daiseki Construction Co., Ltd.

Established a Road Department and strengthened the road maintenance business division.

The Road Department was separated and Daiseki Road Co., Ltd. was established with a capital of 100 million yen. Headquarters in Ginza, Chuo-ku; branches in Osaka and Sapporo.

Dasei Road Co., Ltd. was established in June 1961 (Showa 36) with the purpose of managing construction and paving works, waterproofing, and manufacturing and selling construction materials related to roads. The capital was 100 million yen, and Dasei Construction owned 188,000 of the 200,000 issued shares.

In its first year of establishment, completed the 'Haneda Airport Apron Expansion Project' and the 'Capital Expressway No. 1 Honmachi–Suzugamori Paving Project', and introduced American-made road crushers and German Fegel concrete spreaders and finishers to improve productivity and ensure quality.

Opened a machine maintenance factory in Omiya City. Upgraded the Nagoya office to a branch; the following year renamed it Central Japan Branch.

Amid a nationwide spirit that 'building roads builds the nation,' the growing demand for large-scale construction by machinery led to the opening of a machine maintenance factory in Omiya City, Saitama Prefecture.

Upgraded the Sendai office to a Tohoku Branch and renamed it. Moved headquarters to 3-kyobashi, Chuo-ku, Tokyo.

Established a research institute in Toyosu, Koto-ku. Listed shares on the Second Section of the Tokyo Stock Exchange.

The company was listed on the Second Section of the Tokyo Stock Exchange in the year the Tokyo Olympics were held. In the same year, it established a technology research institute in Toyosu, Koto-ku, Tokyo.

The Meishin Expressway, Japan's first expressway, opened, and the company was responsible for the paving work between Hashima and Ichinomiya.

Opened a machine factory in Urawa City. Upgraded the Fukuoka office to a Kyushu Branch and renamed it. Renamed the Kanto Construction Division to Kanto Branch. Moved the research institute to Urawa City.

The company introduced a 120 t/h plant manufactured by Harbor Green and worked to improve production capacity.

It completed the Ōtsu-gi Dam (Fukushima Prefecture), Japan's first dam with a water-retaining wall.

Reclassified to the First Section of the Tokyo Stock Exchange. Closed the Omiya and Urawa factories and opened the Koshino Machine Center in Koshino City.

The company closed its machine factory in Ōmiya and Urawa and completed a state‑of‑the‑art machine center in Koshigaya City, Saitama Prefecture.

Opened a research institute equipped with the latest equipment in Urawa City. Upgraded the Hiroshima office to a Chugoku Branch and renamed it. Established a Hokuriku Branch in Kanazawa City (later moved to Niigata City).

A technology research institute equipped with the latest facilities was completed in Urawa City, Saitama Prefecture.

To address air pollution such as photochemical smog, pollution control equipment was installed at each composite material plant.

The Tohoku Expressway between Yaita and Shirakawa opened, and the company was responsible for cement concrete paving.

The company developed asphalt modifiers such as TR-100, which is resistant to pothole formation, and all‑weather tennis court paving material TD Soft Color.

The company participated in the Seto Ohashi Bridge construction and was responsible for special asphalt goose paving.

Upgraded the Takamatsu office to a Shikoku Branch and renamed it.

Established subsidiary (Ltd.) Bo.

The company established a local subsidiary, TAISEI ROTEC INC., in Washington State, USA, and leveraged its advanced surface renewal technology (heat‑reforming) to complete projects such as the runway repair at Diapark Airport in Washington State and the repair of State Route 213 in Oregon.

The company successfully secured its first large‑scale construction contract. The new construction of the Seto Ohashi Onsen Hall Yamahoshi, aligned with the opening of the Seto Ohashi Bridge, had a short construction period of seven months and was a difficult project due to shortages of materials and labor, but it was completed on schedule thanks to the unified effort of the Daiseki Group.

As a 30th anniversary commemorative project, established a training center in Koshino City and moved the research institute there.

Renamed the company to Daiseki Rotech Co., Ltd.

In the year the company celebrated its 30th anniversary, it changed its name to the current 'Daiseki Rotech Co., Ltd.' This was a strong declaration of intent by the management and all employees to expand and strengthen business into a wide range of construction fields beyond road paving for the new era.

In the same year, a comprehensive facility was built on the vast site in Koshigaya City where the machine center had been located, housing a training center and a technology research institute relocated from Urawa City. With more advanced equipment for research and development and the ability to conduct long‑term technical training for large numbers of people, the company's technical level was further improved, enabling the maintenance of high levels of construction and product quality.

Divided the Kanto Branch into Yokohama Branch, North Kanto Branch, East Kanto Branch, and Tokyo Branch.

The East Kanto Branch's Boso Composite Material Factory obtained ISO 14001 certification. The Tokyo Branch obtained ISO 9002 certification.

Established a joint venture in Beijing, China. Founded Beijing Road New Daiseki Ascon Co., Ltd., which manufactures and sells asphalt.

All branches completed obtaining ISO 9001 certification.

Established a joint venture in Beijing, China. The four parties—Beijing Lu Xin, the Beijing Municipal Government, our company, and Nichireki—established Beijing Lu Xin Dasheng Landscape Paving Co., Ltd., focusing on special paving works.

Integrated the Tokyo branch, Yokohama branch, and North Kanto branch into a single Kanto branch.

Obtained ISO 14001 certification company-wide.

Our company and Nichireki established the joint venture Beijing Municipal Government First Construction Engineering Co., Ltd.

Obtained ISO 9001 certification company-wide, including the headquarters' Production Technology Division.

The full acquisition of Dasei Construction Co., Ltd. led to the discontinuation of listing on the First Section of the Tokyo Stock Exchange.

Relocated headquarters to 8-8 Nishishinjuku, Shinjuku-ku, Tokyo.

The China branch merged with the Shikoku branch and was renamed Central Shikoku branch. The joint venture Beijing Lu Xin Dasheng Ascon Co., Ltd. was terminated.

Divided the Kanto branch into North Kanto and South Kanto branches.

FY 2017 (Heisei 29).

In FY 2018 (Heisei 30), established the International branch. Adopted a new symbol mark and slogan for the Dasei Construction Group, refreshing it into a unified group symbol.

In FY 2019 (Reiwa 1), established the Yokohama branch. Renamed the Hokuriku branch to Hokushinetsu branch. Established the subsidiary Dasei Lotech Vietnam in Hanoi, Vietnam.

FY 2021 (Reiwa 3): 60th anniversary of establishment.

FY 2023 (Reiwa 5): Our company and Showa Asphalt Industry established the joint venture Tokyo Emulsion Center and commenced emulsion business.

FY 2024 (Reiwa 6): Kenji Kagata assumed the role of President and Representative Director.

FY 2025 (Reiwa 7): Opened the Dasei Construction Group Next-Generation Technology Demonstration Center/Tamura in Tamura City, Fukushima Prefecture.

FY 2026 (Reiwa 8): Commenced full operation of the Dasei Construction Group Next-Generation Technology Research Institute/Hokotate in Hokotate City, Saitama Prefecture.