the present invention employs an actuator including : a movable portion connected to a reflecting member having a reflective surface ; a movable comb electrode disposed at a distance from the reflecting member , supported by the movable portion , and extended in a direction parallel to the reflective surface ; a stationary comb electrode supported by a supporting portion , extends in the direction parallel to the reflective surface , and disposed alternately with the movable comb electrode ; and a voltage controller that applies a voltage to the movable comb electrode and the stationary comb electrode to displace the movable comb electrode and the movable portion in a direction normal to the reflective surface . a portion that supports the movable comb electrode and a portion that supports the stationary comb electrode are disposed such that the movable comb electrode and the stationary comb electrode pass each other .