A treatment tool for endo scope includes a pair of forceps members (first forceps members and second forceps member) supported by a forceps rotation axis such that they can rotate relatively, an operation part for performing an open-close operation of the pair of forceps members, an operation wire that connects the pair of forceps members and the operation part, an insertion part which the operation wire is inserted into, a cover member that secures the forceps rotation axis to the insertion part, a connection member including a link rotation axis, provided at a distal-end part of the operation wire, and a pair of link members (first link member and second link member), first end parts of each being rotatably connected via respective rotation axis members to a proximal-end part of each of the pair of forceps members, and second end parts of each being rotatably connected to the link rotation member. The cover member includes grooves formed such that, by engaging with end parts of the rotation axis members, they restrict the movement of the rotation axis members in a direction of approaching the axis of the operation wire.