In the movable body one of a magnet and a core that has a magnetic pole surface disposed so as to face a magnetic pole surface of the magnet via an air gap and around which a coil is wound is provided on each of both sides across the shaft of the support shaft part in the movable body, and in the fixing body the other is provided facing the magnet or core disposed on both sides of the shaft of the support shaft part in the movable body. The movable body is elastically supported by magnetic attractive force generated between the magnetic pole surfaces at each of both sides across the shaft and vibrates back and forth in the direction of the shaft of the support shaft part with respect to the fixing body by the coil interacting with the magnet.