PURPOSE: To reduce the noise in a unit bath and miniaturize a pump by installing the pump between a unit bath panel and a bathtub via vibration-proof rubber, and connecting it to bathtub connecting metals on the suction side and discharge side arranged through the side wall of the bathtub with rubber hoses.

CONSTITUTION: Two holes are bored on the side wall of a bathtub 1, a suction side bathtub connecting metal 2 and a discharge side bathtub connecting metal 3 are arranged respectively and installed in a pan type unit bath. A pump 4 installed on the floor via vibration-proof rubber 6 is connected to the suction side bathtub connecting metal 2 and discharge side bathtub connecting metal 3 via a suction side pipe 7 and a discharge side pipe 8 of a rubber hose respectively. A control board 9 incorporating a transformer installed on a bathroom wall face 11 and the pump 4 are connected with electric wires through the panel 5 of the unit bath and the bathroom wall face 11, and a bathtub apron 10 is finally installed to complete construction. No metal is required for the pipe material, replaceable rubber hoses are used, the vibration of the pump 4 is damped by the pipes 7, 8 and is not transferred to the bathtub 1, and the noise in the bathroom is reduced.