The gripping portion near comprise open gripping member provided on the distal side of the treatment instrument insertion portion, an open state, intraperitoneal or operation corresponding forceps comprises a grip portion opening and closing operation unit for switching to the closed state of the gripping member have. The procedure of using the intraperitoneal operation corresponding forceps, the assistant and the surgeon, and observing an endoscopic image of a body with an endoscope that is inserted into the body through the first trocar, the assistant, through the second trocar inserted into the body Te, manipulate intraperitoneal operation corresponding forceps, the surgeon operates the treatment tool that has been inserted into the body through a third trocar, depending on the circumstances of the procedure, the surgeon, endoscope by operating at a treatment instrument while observing the mirror image, the surgeon himself to manipulate the grip portion opening and closing operation of the intraperitoneal operation corresponding forceps assistant to operate, the abdominal cavity by closing operation gripping members of intraperitoneal operation corresponding forceps I to grasp the tissue in the grip portion of the inner operation corresponding forceps.腹腔内操作対応鉗子は、処置具挿入部の先端側に設けられた開閉可能な把持部材を備える把持部近傍に、前記把持部材を開状態、或いは閉状態に切り換える把持部開閉操作部を具備している。この腹腔内操作対応鉗子を使用する手技において、執刀医及び助手は、第1トラカールを介して体内に挿入した内視鏡で体内の内視鏡画像を観察し、助手は、第2トラカールを介して体内に挿入された、腹腔内操作対応鉗子を操作し、執刀医は、第3トラカールを介して体内に挿入された処置具を操作し、執刀医は、手技の状況に応じて、内視鏡画像を観察しつつ、助手が操作する腹腔内操作対応鉗子の把持部開閉操作部を執刀医自身が操作する処置具で操作して、腹腔内操作対応鉗子の把持部材を閉動作させて腹腔内操作対応鉗子の把持部で組織を把持させる。
