A treatment apparatus includes a rotor which is provided between a distal-end treatment section and a flexible tube section and which is rotatable together with the distal-end treatment section in the periaxial directions with respect to the flexible tube section, a rotational operation wire which is configured to be pulled or loosened by a rotational operation section to rotate the distal-end treatment section, and a wire fixing portion which is provided to the rotor or to a part to the distal-end direction side of the rotor and to which a distal end of the rotational operation wire is fixed. The treatment apparatus includes a direction change portion which is configured to change an extending direction of the rotational operation wire extended on an outer peripheral surface of the rotor from the wire fixing portion, and configured to lead out the rotational operation wire to the rotational operation section.
