The ultrasonic probe for a shoulder joint includes a curved extending portion that curves with respect to the probe main body portion toward a first intersecting direction that intersects the longitudinal axis. The curved extending portion includes a first curved outer surface facing the first intersecting direction, a second curved outer surface facing the second intersecting direction opposite to the first intersecting direction, A third width outer surface facing the first width direction and the first width direction side perpendicular to the first cross direction and the second cross direction； and a second opposite to the first width direction A fourth curved outer surface facing the width direction side. The cutting surface formed on the second curved outer surface has a groove extending pattern different from the cutting surfaces formed on the third curved outer surface and the fourth curved outer surface, respectively.肩関節用の超音波プローブは、長手軸に交差する第１の交差方向側へプローブ本体部に対して湾曲する湾曲延設部を備える。前記湾曲延設部は、前記第１の交差方向側を向く第１の湾曲外表面と、前記第１の交差方向とは反対の第２の交差方向側を向く第２の湾曲外表面と、前記第１の交差方向及び前記第２の交差方向に垂直な第１の幅方向第１の幅方向側を向く第３の湾曲外表面と、前記第１の幅方向とは反対の第２の幅方向側を向く第４の湾曲外表面と、を備える。前記第２の湾曲外表面に形成される切削面は、前記第３の湾曲外表面及び前記第４の湾曲外表面のそれぞれに形成される切削面に対して、溝の延設パターンが異なる。
