An ultrasonic vibrator includes a piezoelectric laminated-section; a frictional contact-section serving as a driving point upon coming into contact with a moving-table serving as a driven body; and a pin serving as a projection and disposed at a node of a generated vibration. When alternating voltages are applied on external electrodes of the piezoelectric laminated-section, an ultrasonic elliptical vibration is generated at the frictional contact-section. The pin is composed of a resin member such as polyether-ether-ketone.