Endoscopic treatment tool of the present invention (1), a pair of forceps members which is supported by the relatively rotatable clamp rotary shaft ((11), the second forceps member first gripper member (12)) and , an operating wire connecting the operation portion and the operation portion for opening and closing operation of the forceps members of a pair, the forceps members of a pair, an insertion portion which is inserted through the operation wire, forceps rotation axis with respect to the insertion portion cover for fixing the (14), has a link rotation shaft, the rotary shaft at the proximal end of each of the forceps members and a pair of connecting members, which is provided at the distal end portion of the operation wire, the first end (35), the second link (first link member pair of link members which are rotatably connected via a (38, 39) member, the second end is pivotally connected to the link pivot axis I and a (36)) members. The cover (14), (14A, 14B grooves to regulate it to move in the direction of the rotation shaft member approaches the axis of the operating wire (X1) by engaging an end portion of the rotary shaft member I have).本発明の内視鏡処置具(1)は、鉗子回動軸によって相対的に回動可能に支持された一対の鉗子部材(第1鉗子部材(11)、第2鉗子部材(12))と、一対の鉗子部材の開閉操作を行うための操作部と、一対の鉗子部材と操作部とを接続する操作ワイヤと、操作ワイヤが挿通された挿入部と、挿入部に対して鉗子回動軸を固定するカバー(14)と、リンク回動軸を有し、操作ワイヤの先端部に設けられた接続部材と、第一の端部が一対の鉗子部材の各々の基端部に回動軸部材(38、39)を介して回動可能に連結され、第二の端部がリンク回動軸に回動可能に連結された一対のリンク部材(第1リンク部材(35)、第2リンク部材(36))とを備える。そして、カバー(14)は、回動軸部材の端部と係合することにより回動軸部材が前記操作ワイヤの軸線(X1)に接近する方向に移動することを規制する溝(14A、14B)を有する。
