To reduce the cost, to miniaturize a device and to lighten it in weight while keeping a high function.

A super-elastic alloy with a high fatigue limit is adopted as a torsion sprincy 5, and a mirror finished minute magnet 3 is attached to the spring center. A coil 7 is placed on the outside of the magnet 3, and alternate magnetic field is generated by making flow an alternate current through the coil, and the mirror finished minute magnet 3 is resonantly vibrated. Thus, an optical scanner is miniaturized and lightened.