PURPOSE: To reduce the vibration attenuation even if an ultrasonic vibration transfer member is curved, and to improve the safety by forming the ultrasonic vibration transfer member for transferring ultrasonic vibration to the part to be processed by an ultraelastic alloy.

CONSTITUTION: In the inside of a hand piece 1, an ultrasonic vibrator 2 is contained, and in a horn 3 of this ultrasonic vibrator 2, a screw part 4 is provided, and to this screw part 4, a connecting member 5 is screwed in and fixed. Also, to this connecting member 5, a probe 6 being an ultrasonic vibration transfer member is connected by brazing or adhesion, and this probe 6 is formed by a wire of an ultraelastic alloy of, for instance, a Ti-Ni alloy, etc. Accordingly, ultrasonic vibration generated by the ultrasonic vibrator 2 is transferred efficiently to the probe 6 and its tip vibrates. In such a way, as for the ultrasonic vibration transfer member 6, the curvature capacity is also small, and its insertion into a body-cavity can also be executed easily.