The medical device includes a vibration transmission member capable of transmitting vibrations used for treatment, a contact position that is in contact with the vibration transmission member, and a jaw that is moved away from the vibration transmission member. And a cover that is provided at a position sandwiching the vibration transmission member between the jaw and a first tip portion at a distal end that contacts the vibration transmission member when the jaw is located at a close position.医療機器は、処置に用いる振動を伝達可能な振動伝達部材と、前記振動伝達部材に当接した当接位置と、前記振動伝達部材から離隔した離隔位置と、の間で移動するジョーと、前記ジョーとの間に前記振動伝達部材を挟む位置に設けられるとともに、前記ジョーが近接位置に位置する場合に、先端にある第１先端部が前記振動伝達部材に接触するカバーと、を有する。
