The medical device holds a treatment member and has an electrically insulating first member having an opening edge communicating with the back surface of the treatment member, an electric element provided on the back surface of the treatment member, and the first member. A second member in close contact with the opening edge of the member or a region outside the opening edge.医療器具は、処置部材を保持するとともに、処置部材の裏面に連通する開口縁を有する電気絶縁性を有する第１の部材と、前記処置部材の前記裏面に設けられた電気素子と、前記第１の部材の前記開口縁又は前記開口縁の外側の領域に密着する第２の部材とを有する。
