A motor includes: a rotating shaft (22); a motor portion (20) for rotationally driving the rotating shaft; a circuit board (56) for controlling rotational driving of the rotating shaft; a case (41) having a circuit housing recess portion (46) for housing the circuit board; and a cover (61) made of a synthetic resin and sealing the opening portion (46a) of the circuit housing recess portion. The cover has an outer circumference rib (62) and an inside rib (63, 64). The outer circumference rib is located on the outer circumferential side from the opening end surface (46e) of the circuit housing recess portion and projects from the outer circumferential edge of the cover toward the front surface (61a) side of the cover and the rear surface (61b) side of the cover. The inside rib is located inside from the opening end surface and projects at least either on the front surface side of the cover or on the rear surface side of the cover.