TANAKEN Inc. engages in the planning of construction and management of demolition work of building structures and related construction work in Japan. The company offers planning, construction planning, outsourcing and equipment arrangement, construction management, safety management, cost management, fund management, administrative correspondence, and neighborhood correspondence. It also undertakes demolition business, soil and underground remediation, civil engineering work, and recycling business. The company was formerly known as Tanaken and changed its name to TANAKEN Inc. in April 2025. The company was incorporated in 1982 and is headquartered in Tokyo, Japan. TANAKEN Inc. is a subsidiary of Three Hundred Holdings Co., Ltd.