An endoscopic treatment instrument (11) includes: a long tube body (12) to be inserted into a body cavity, including a flexible member a first bending portion (14) provided to a distal end part of the tube body, for bending the tube body with respect to an axial direction a second bending portion (15) provided in a linked manner to a proximal end side of the first bending portion, for bending the tube body in the axial direction and a bending operation portion for independently bending the first and second bending portions.
