An endoscopic treatment tool includes a flexible sheath an operating member inserted to the sheath so as to freely advance and retract a treatment section disposed at the distal end of the operating member that protrudes and retracts from the sheath and an operator section connected to the proximal end of the operating member including a sliding member which makes the operating member advance and retract. The endoscopic treatment tool includes the operating member consisting of a member which increases its rigidity by compression, and a member which compresses the operating member. Therefore a sufficient incision or excision is achieved relative to the distance of movement of the treatment tool by preventing a deflection of the flexible tube when in use.
