Yamau Holdings Co., Ltd. is a Japanese firm deeply involved in the provision of infrastructure and construction materials. The company's operations encompass the creation and distribution of concrete goods, including civil engineering and landscape items, across Japan. They are also specialists in the fabrication, erection, and upkeep of steel structures like water gates and weirs. Furthermore, the company delivers geological surveys, advisory services, and general civil engineering contracting. Their expertise extends to detailed inspections, investigations, and rehabilitation of concrete infrastructure, alongside the production, distribution, and fitting of bridge and elevated road expansion devices. Additionally, Yamau Holdings markets and services information office systems. The entity rebranded from Yamau Corporation to Yamau Holdings Co., Ltd. in 2021 and was established in 1958, maintaining its main office in Fukuoka City, Japan. In late 2025, the company showcased its solutions at the "Advanced Construction, Disaster Prevention, and Disaster Mitigation Technology Fair in Kumamoto" and the "47th National Land Improvement Conference Saga Convention."