Kongō Gumi Co., Ltd. is a Japanese construction company founded in the year 578 A.D., making it the world's oldest functioning company, Kongō Gumi Co., Ltd. is headquartered in Osaka. It started out as a family-owned business and has been in operation for over 1,400 years and has been passed down through 40 generations, it has been operated its founder's descendants and continues to be even in the present. The company has been a subsidiary of the Takamatsu Construction Group since January 2006.