To provide a rotary brush for water washing used as a washing tool using tap water supplied to general homes, forming a rotary body containing a rocking vane as a pressure receiving face having a large running water pressure receiving area to the compact rotary body, forming a rocking vane motor using the rotary body with the rocking vane as a rotor, and using the rocking vane motor.

This rotary brush for water washing is constituted in such a way that the rocking vane motor is used having a vane body with the large running water pressure receiving area as a constitution element, sufficient torque needed is obtained even using domestic tap water pressure, and further a brush tool having implanted brushes and water discharge holes penetrating through a disk in the vicinity of the outer periphery of the disk is used, and drain of the rocking vane motor is used as washing water while rotating the brush tool.