An ultrasonic probe, which transmits ultrasonic vibrations from a proximal end to a distal end, includes an outer peripheral portion provided along a longitudinal axis, and a surface continuous portion including a perpendicular plane perpendicular to the longitudinal axis, and provided in a state that a distal end of the outer peripheral portion is an outer edge with a surface thereof being continuous. The surface continuous portion produces cavitation when the ultrasonic vibrations are transmitted to the surface continuous portion. The ultrasonic probe includes a path defining surface defining a suction path inside along the longitudinal axis from the proximal end to a part to a proximal direction side of the surface continuous portion, and an opening defining surface defining a suction opening extending from the outer peripheral portion to the suction path.
