Kumagai Gumi, founded in 1898, is a general contractor that builds apartments, office buildings and hospitals as well as infrastructure such as tunnels, bridges and dams. In civil engineering it focuses on renewing aging expressways, including bridge deck slab replacement, and on unmanned construction for disaster response; in building it promotes medium- and large-scale wooden construction through the with TREE brand launched with Sumitomo Forestry in 2021.
Overseas, its Taiwan subsidiary has built landmarks including Taipei 101, and the group takes part in managing and maintaining Hong Kong's Eastern Harbour Crossing and Tate's Cairn Tunnel. It also develops real estate and biomass and solar power projects. It is headquartered in Shinjuku, Tokyo, with its registered office in Fukui, and had 2,740 employees as of March 31, 2026.
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