An ultrasonic probe which extends from a proximal end to a distal end along a central line and which is configured to perform at the distal end a longitudinal vibration having a vibration direction parallel to the central line when an ultrasonic vibration is transmitted to the proximal end, the ultrasonic probe comprising: - a probe body in which the central line is coaxial with an X-axis, and which is shaped symmetrically with respect to an X-Z plane defined by the X-axis and the Z-axis, whereby a Y-axis which intersects at right angles with the X-axis, and the Z-axis which intersects at right angles with the X-axis and which intersects at right angles with the Y-axis are defined; - a distal asymmetric portion which is provided at the distal side of the probe body, and which is shaped asymmetrically with respect to the X-Z plane, and which is shaped symmetrically with respect to the X-Y plane defined by the X-axis and the Y-axis, such that, at the distal end, in operation, a first lateral vibration, having a vibration direction which is in the X-Y plane and which is perpendicular to the central line, is superposed on the longitudinal vibration CHARACTERIZED BY - a proximal side probe component which is provided at the proximal side of the probe body, and which is bent relative to the probe body at a bending position (B1;B2) so that the proximal side probe component is tilted relative to the X-axis and shaped symmetrically with respect to the X-Y plane, such that, at the distal end, in operation, a second lateral vibration, which has the same wavelength and vibration direction as the first lateral vibration and which is in anti-phase with respect to the first lateral vibration, is superposed on the longitudinal vibration and the first lateral vibration. - a probe body in which the central line is coaxial with an X-axis, and which is shaped symmetrically with respect to an X-Z plane defined by the X-axis and the Z-axis, whereby a Y-axis which intersects at right angles with the X-axis, and the Z-axis which intersects at right angles with the X-axis and which intersects at right angles with the Y-axis are defined; - a distal asymmetric portion which is provided at the distal side of the probe body, and which is shaped asymmetrically with respect to the X-Z plane, and which is shaped symmetrically with respect to the X-Y plane defined by the X-axis and the Y-axis, such that, at the distal end, in operation, a first lateral vibration, having a vibration direction which is in the X-Y plane and which is perpendicular to the central line, is superposed on the longitudinal vibration - a proximal side probe component which is provided at the proximal side of the probe body, and which is bent relative to the probe body at a bending position (B1;B2) so that the proximal side probe component is tilted relative to the X-axis and shaped symmetrically with respect to the X-Y plane, such that, at the distal end, in operation, a second lateral vibration, which has the same wavelength and vibration direction as the first lateral vibration and which is in anti-phase with respect to the first lateral vibration, is superposed on the longitudinal vibration and the first lateral vibration.