This invention enables to downsize an electric retracting unit. An electric retracting unit includes a frame that houses a power transmission mechanism and a motor holding member that holds a motor. The frame and the motor holding member are fixed to each other. A structure of the fixation includes a structure in which a screw is inserted from the frame side and screwed into the motor holding member. At least one fixation place including this fixation structure is disposed at a position at which at least a part of the at least one fixation place overlaps a motor body of the motor as viewed in a direction parallel to an axis of the shaft.