Torr clenching (41,61) the head (43), the head itself (44) from projection height becomes large gradually the head itself (44) lap according to direction, the ultrasonic probe (11) screws in the aforementioned ultrasonic vibrator (6) the tilt slant face which is laid out when direction of rotation it is faced at the time of the revolution manipulation which (46a1,46b1) with, the head itself (44) the stopper aspect which extending facilities is done (46a2,26b2) with the spine which each one has (46a and 46b) has for radial. In addition, the head (43), the engaged portion (32,51) the engagement section (34) the spine (46a and 46b) with the engagement section (47a and 47b) from the engaged portion (32,51) the occasion where torque is added, the engaged portion (32,51) the torque which is added specified configuration torque until it reaches, the head itself (44) the slit (45) elasticity the elastic deformation section which it makes become deformed (48) is had for the direction where the both sides part one side the slit (45) width spreads at least when it is engaged.トルクレンチ(41,61)のヘッド(43)は、ヘッド本体(44)の周方向に沿ってヘッド本体(44)からの突出高さが徐々に大きくなり、超音波プローブ(11)を前記超音波振動子(6)に締め込む回転操作時に回転方向を向く状態で配置される傾斜面(46a1,46b1)と、ヘッド本体(44)の半径方向に延設されるストッパ面(46a2,26b2)とをそれぞれが備える突起部(46a,46b)を備える。また、ヘッド(43)は、被係合部(32,51)の噛み合い部(34)が突起部(46a,46b)と噛み合った状態で係合部(47a,47b)から被係合部(32,51)にトルクを加える際に、被係合部(32,51)に加えるトルクが所定の設定トルクを達するまで、ヘッド本体(44)のスリット(45)の両側部分の少なくとも一方をスリット(45)の幅が広がる方向に弾性変形させる弾性変形部(48)を備える。
