<p>A wiper motor (10) has a motor body (11) provided with: a motor case (13) for rotatably supporting an end of the motor shaft (17) in the axial direction thereof; a reduction mechanism (26) for reducting the speed of rotation of the motor shaft (17) and transmitting the rotation having the reduced speed to a worm wheel (35); and a motion conversion mechanism (29) for converting the rotational motion of the worm wheel (35) into a rocking motion and transmitting the rocking motion to an output shaft (28). The position of the output shaft (28) is set so that the axis (C1) of the output shaft (28) is closer to the motor case (13) than the axis (C2) of the worm wheel (35) and is farther from the axis (C2) of the worm wheel (35) than the axis (C) of the motor shaft (17).</p>
