PURPOSE: To maximize a moving distance and to hold a switching position at high accuracy by using a linear ultrasonic motor as a drive means that switches a light transmitting means and a light receiving means.

CONSTITUTION: The linear ultrasonic motor moving one-dimensionally is used as the drive means 13 which switches an optical fiber group in the light transmitting means 11 and an optical diode in the light receiving means 12. Giving an electrical signal to a piezoelectric plate 14, the ultrasonic motor generates the advance wave of a sound wave in a stator 15, and moves a rotor 16 with said advance wave as a drive source. Consequently a linear movement in a long distance is attainable, plural optical paths can be switched. A fine move is possible, and therefore position accuracy is enhanced. Unless a voltage is applied, the position can be maintained.