The treatment instrument is provided in a state of being fixed to the grip operation wire on the distal direction side of the grip operation wire, and includes a wire distal member that moves in the longitudinal direction by pulling or relaxation of the grip operation wire. The treatment instrument has a first operation state in which the grip portion is operated in a closed state and a second operation in which the grip portion is operated in an open state in response to the movement of the wire tip member in the longitudinal direction. An operating member whose operating state changes between the state, a first connecting portion to which the wire tip member is movably connected in the longitudinal direction, and the operating member to the wire tip member and the flexible tube portion And a connecting member including a second connecting portion that is connected to the distal treatment portion so as to be rotatable in the direction around the axis.処置具は、把持操作ワイヤより先端方向側に前記把持操作ワイヤに固定された状態で設けられ、前記把持操作ワイヤの牽引又は弛緩により前記長手方向に移動するワイヤ先端部材を備える。前記処置具は、前記ワイヤ先端部材の前記長手方向への移動に対応して、把持部が閉状態に作動される第１の作動状態と前記把持部が開状態に作動される第２の作動状態との間で作動状態が変化する作動部材と、前記ワイヤ先端部材が前記長手方向に移動可能に連結される第１の連結部と、前記作動部材が前記ワイヤ先端部材及び可撓管部に対して先端処置部と一体に軸回り方向に回転可能に連結される第２の連結部とを備える連結部材とを備える。
