Underwater construction works in port areas are mostly depended on divers. These divers are confronted with many difficulties, such as working time limitation due to depth, poor visibility on working field and so on. These problems can be overcome using machineries in underwater construction. The practical unmanned underwater equipment for port construction was newly developed. The equipment can be applicable to underwater leveling works of rubble mound by using its blade and bucket with automatic arms. Also, it can monitor working environment using sonars and optical devices. Through the development of our equipment, it can be expected to be safer and more efficient construction.be overcome using machineries in underwater construction. The practical unmanned underwater equipment for port construction was newly developed. The equipment can be applicable to underwater leveling works of rubble mound by using its blade and bucket with automatic arms. Also, it can monitor working environment using sonars and optical devices. Through the development of our equipment, it can be expected to be safer and more efficient construction.