The Sumitomo Mitsui Construction Company, Ltd. is a Japanese general construction company based in the Chuo ward of Tokyo. The company traces it routes back to 1887, when Nishimoto-Gumi, the predecessor of Mitsui Construction, was established. This company was incorporated in 1941. The current company was formed in 2003 when Mitsui Construction and Sumitomo Construction agreed to merge. The company is part of the Mitsui Group and Sumitomo Group. Wikipedia