ULTRASONIC PROBE AND TREATMENT SYSTEM

An ultrasound probe includes a treatment portion that is formed at a distal end of a transmission portion transmitting input vibration energy, the treatment portion being configured to vibrate with a predetermined amplitude to cut a treatment target object, in which the treatment portion includes a first striking face that faces the treatment target object, a second striking face that faces the treatment target object at a position away from the first striking face toward a proximal end side in an axial direction, and a first side surface that connects the first striking face and the second striking face in the axial direction and that has a predetermined length in the axial direction, in which when the predetermined length of the first side surface is h, 0 < h ≤ 200 [µm] is satisfied.