A treatment apparatus includes a wire distal member provided to a distal direction side of a grip operation wire to be fixed to the grip operation wire, and being moved in longitudinal directions by pulling or loosening the grip operation wire. The treatment apparatus includes an actuated member whose actuated state changes, in accordance with movement of the wire distal member in the longitudinal directions, between a first actuated state in which a grip portion is actuated to a closed state and a second actuated state in which the grip portion is actuated to an open state, and a coupling member including a first coupling portion to which the wire distal member is coupled to so as to move in the longitudinal directions, and a second coupling portion to which the actuated member is coupled so as to rotate together with the distal treatment section to directions about an axis relative to the wire distal member and a flexible tube section.
