To provide a motor capable of reducing size and saving a cost while preventing noise during rotation in a motor having a reduction gear.

A motor is rotatably supported by a ball bearing 10 wherein one end of a rotating shaft 4 is fixed to a yoke housing 1. An output shaft 8 has an engage part 15 engaging with a plurality of balls provided on the ball bearing 10, and when the balls revolve about the rotating shaft 4 while rotating on its axis on the basis of the rotation of the rotating shaft 4, the output shaft 8 rotates at a revolving speed by engaging the engage part 15 in a revolving direction.