An actuator 1 is disclosed including a stationary member 15, a rotational member 17 disposed for rotating capability with respect to the stationary member 15, a movable member 19 disposed for movements with respect to the rotational member 17, a drive power source 25 rotating the rotational member 17, and a converting mechanism disposed between the rotational member 17 and the movable member 19 to convert rotation of the rotational member to an operating force for an operative unit.