A treatment manipulator including an inserted-portion main unit； at least one arm provided so as to protrude forward from a distal-end surface of the inserted-portion main unit and that has an end effector at the distal end； and an endoscope provided in the inserted-portion main unit that has a viewing-field area in which the end effector at the distal end of the arm can be observed, wherein the arm having, sequentially from the distal-end side, a first flexing joint that can pivot the end effector about a first axis orthogonal to a longitudinal axis of the arm, an intermediate roll joint that can be rotated about the longitudinal axis, and a second flexing joint that can be pivoted about a second axis orthogonal to the longitudinal axis, and the first flexing joint can be flexed 90° or more, at least on one side, with respect to the longitudinal axis.
