A rotor of a treatment apparatus includes a first outer surface, and a second outer surface spaced apart from the longitudinal directions axis of a flexible tube section by a distance smaller than that of the first outer surface in radial directions. The treatment apparatus includes a first rotating operation wire which extends to the first outer surface along a first oblique direction inclining from longitudinal directions to a first rotation direction, and a second rotating operation wire which extends to the second outer surface along a second oblique direction inclining from the longitudinal directions to a second rotation direction.
