TAISEI Corp. engages in the construction and engineering business. It operates through the following segments: Civil Engineering, Construction Contracts, Real Estate Development, and Others. The Civil Engineering segment covers infrastructure and engineering works such as tunnels, bridges, dams, and airports. The Construction Contracts segment deals with the construction of housing and buildings. The Real Estate Development segment develops, buys, and sells land and buildings. The Others segment includes incidental businesses related to construction and leisure operations. The company was founded by Kihachiro Okura in October 1873 and is headquartered in Tokyo, Japan.