PROBLEM TO BE SOLVED: To provide a treatment tool for an endoscope capable of avoiding interference due to a guide wire which causes a change in the opening/closing direction when a pair of treatment parts are opened corresponding to an affected part in a body cavity. SOLUTION: A sheath 11 having flexibility, an operation wire 12 arranged so as to be able to move forward and backward in the sheath 11, an operation portion 13 for operating the operation wire 12 forward and backward, and a treatment provided at a distal end portion of the sheath 11. The part support means 14 and the midway parts 15a and 16a of the treatment part support means 14 are rotatably supported by the support shaft 18, and the distal end side parts 15c and 16c are opened and closed to treat a living tissue in a body cavity. The treatment portion 15 and 16 and the guide wire engagement means 20 for guiding along the guide wire 30 are provided, and the support shaft 18 is formed with the shaft hole 19 penetrating both ends, and the guide wire engagement is formed. The means 20 is supported by a support portion 20b provided in the shaft hole 19 of the support shaft 18 with an engagement guide portion 20a with which the guide wire 30 is inserted. [Selection diagram] Fig. 4【課題】一対の処置部を体腔内の患部に対応し開くときに、開閉方向の向きを変わる要因となるガイドワイヤによる干渉を回避できる内視鏡用処置具を提供すること。【解決手段】可撓性を有するシース１１と、シース１１内に進退可能に配置された操作ワイヤ１２と、操作ワイヤ１２を進退操作する操作部１３と、シース１１の先端部に設けられた処置部支持手段１４と、処置部支持手段１４の中途部１５ａ，１６ａが支持軸１８で回動可能に支持され、先端側部分１５ｃ，１６ｃが開閉して体腔内の生体組織の処置を行う一対の処置部１５，１６と、ガイドワイヤ３０に沿って案内するためのガイドワイヤ係合手段２０と、を備え、支持軸１８が両端を貫通する軸孔１９を有して形成され、ガイドワイヤ係合手段２０は、ガイドワイヤ３０が挿通するように係合する係合案内部２０ａが支持軸１８の軸孔１９内に設けられた支持部２０ｂにより支持される。【選択図】図４
