Installation and sale of long-pile artificial turf "Field Turf"Domestic sales of Olympian Heroes (posters and explanatory books)Sports-related marketing and consultingImport and export businessTelecommunications infrastructure construction, design, and construction for public facilities, commercial facilities, and office buildingsMobile equipment construction: consulting, design, construction, and maintenance of mobile phone base station equipmentElectrical equipment construction: design and construction of electrical equipment for public facilities, commercial facilities, and office buildingsRailway communication construction: installation and construction of in-station equipment such as guide boards, ITV, and ATMsAll related business activities
| Company name | Group | Parent | Subsidiary | Customer | Supplier | Alliance | Bank | Shareholder |
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NECネッツエスアイ・サービス株式会社
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NECネッツエスアイ株式会社
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SBエンジニアリング株式会社
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Tokyu Technosystem Corporation
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株式会社シーテック
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株式会社京王設備サービス
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Establishment of HSJ Incorporated (California, USA)
1996, February: Established as H.S.J. Ltd., capital 3 million yen, primarily engaged in telephone, network, and mobile antenna installation work
Established H.S.J., Incorporated (California, USA)
Establishment of HSJ Japan Branch
2000, January: H.S.J. Co., Ltd., capital increased to 10 million yen, expanded mobile antenna installation on large business and commercial buildings in Tokyo
Launch of domestic sales of CD card (business card size CD-ROM)
First introduction of long-pile artificial turf "Field Turf" in Japan as a general import agent; installation at Kawasaki Frontale training ground (first domestic installation)
2002, February: Signed a contract with a railway group equipment company, expanding business to include electrical and telecommunications work within stations
Installation of Field Turf at Tokyo Dome (reinstalled in 2007, 2014, 2019, 2026)
Installation of Field Turf at Yokohama Stadium (reinstalled in 2011, 2018, 2025)
Installation of Field Turf at Nagasaki Prefectural Baseball Stadium; achieved 50 domestic installations
2005, September: Signed a contract with a major retail group equipment company, expanding business to include electrical and telecommunications work in stores
Launch of domestic sales of Olympian Heroes (posters and explanatory books)
Launch of domestic sales of track and field starting blocks "Bar Sub Block"
First domestic installation of Omnisports sports flooring by Target Sports
Field turf installed at Fukuoka Yahoo! Japan Dome (now Mizuho PayPay Dome Fukuoka) (reinstalled in 2017)
Field turf installed at Toyo University Rugby Field, reaching 100 domestic installations
First domestic installation of artificial turf "Easy Turf" for landscaping
2013, March: Opened own office in Ota Ward to expand business, starting development of network and communication system construction
Introduction of sports headband "Hairo Headband" to Japan
Field turf installed at Shizuoka Gakuen Soccer Club's Tanida Ground, reaching 150 domestic installations
2016, March: Signed a contract with a major subcontractor for communication system equipment work, further expanding business
Marketing activities for the introduction of an American-made laser measurement device for jumping sports
Marketing activities for the introduction of a French-made ice bath
First domestic installation of hybrid artificial turf "Grass Master" by Target Sports Co.
2019, April: Joined the Kinden Technology Safety Cooperation Association
First domestic installation of artificial turf system "Field Turf Pure Select" using 100% natural olive seed fill at Kanagawa Institute of Technology Baseball Field, reaching 200 domestic installations
2021, July: Opened the Hon-Atsugi branch office
2021, December: Opened the Ueno branch office
2023, February: Ueno branch office moved to Nishi-Maigo
Establishment of H.S.J. Co., Ltd., inheriting the business of H.S.J. Incorporated
February 2025: 30th Anniversary of Founding
HSJ Corporation relocated its Hon-Akashi Office to Sagamihara-Ono on September 30 and renamed it the Sagamihara-Ono Office. The new address is M203, 3-16-1 Sagamihara-Ono, Sagamihara City, Kanagawa Prefecture.
HSJ Corporation announced that it will merge with Tōken Engineering Co., Ltd. on October 1, 2026. The merger aims to integrate Tōken Engineering's technical capabilities and know-how with our management resources, enhancing service quality and strengthening our management structure.
We announced that the website was updated on October 1, 2025.
We are announcing that the website was updated on January 1, 2025.
The Ueno Branch Office has relocated to Nishi-Magome.
HSJ Corporation opened the Ueno branch office.
HSJ Corporation opened the Hon-Atsugi branch. The opening date was July 15, 2021.
HSJ Inc. announces the renewal of its website.