A treatment apparatus 1 includes that a rotor 26 which is provided between a distal-end treatment section 4 and a flexible tube section 5 and which is rotatable together with the distal-end treatment section 4 in the periaxial directions with respect to the flexible tube section 5, a rotational operation wire 21A, 21B which is configured to be pulled or loosened by a rotational operation handle 12 to rotate the distal-end treatment section 4, and a wire fixing portion 40 which is provided to the rotor 26 or to a part to the distal-end direction side of the rotor 26 and to which a distal end of the rotational operation wire 21A, 21B is fixed. The treatment apparatus 1 includes that a direction change portion 47A, 47B which is configured to change an extending direction of the rotational operation wire 21A, 21B, extended on an outer peripheral surface of the rotor 26 from the wire fixing portion 40 along an oblique direction inclined from the longitudinal directions toward circumferential directions, from the oblique direction, and configured to lead out the rotational operation wire 21A, 21B to the rotational operation handle 12.
