Disclosed is an amputator, which is provided at one end of a transmitting rod connected to a vibrator generating ultrasonic waves, for amputating a surgical site by means of ultrasonic waves transmitted from the transmitting rod, the amputator comprising: an amputating side which comes in contact with the surgical site； and a direction switching means, which has a depression in one part thereof from a point corresponding to a vibration node, for concentrating the ultrasonic waves on the amputating side, the ultrasonic waves being transmitted at an angle toward the amputating side along the lengthwise-direction.
