Provided is a bipolar high frequency treatment device including a catheter tube insertable into a body through a treatment device passage of an endoscope a first forceps blade and a second forceps blade at the top end of the catheter tube, which first forceps blade and second forceps blade can be opened and closed by operating from outside the body a support member for supporting the first forceps blade and the second forceps blade so that the blades are able to open and close and a voltage supplier for supplying a high frequency voltage to the first forceps blade and the second forceps blade, wherein the first forceps blade and the second forceps blade are electrically insulated with an insulating element.
