An ultrasonic probe that transmits an ultrasonic vibration, generated in an ultrasonic vibrator, from a proximal end to a distal end so that the ultrasonic probe performs a longitudinal vibration in a vibrating direction. The ultrasonic probe including a probe body, a distal asymmetric portion, and a proximal side probe component. The distal asymmetric portion is asymmetric about an X-axis so that a center of gravity of the distal asymmetric portion is deviated from the X-axis and a first lateral vibration of the distal asymmetric portion is superposed on the longitudinal vibration of the ultrasonic probe. The proximal side probe component is bent relative to the probe body at a bending position so that a center of gravity of the proximal side component is deviated from the X-axis and a second lateral vibration of the proximal side component is superposed on the longitudinal vibration of the ultrasonic probe.