A treatment apparatus comprising: a flexible tube section which has a longitudinal directions axis and extends in longitudinal directions; a distal treatment section which is provided to a distal direction side of the flexible tube section, and which is configured to rotate to directions about an axis relative to the flexible tube section; a rotating operation section which is provided to a proximal direction side of the flexible tube section, and which is configured to perform rotating operation of the distal treatment section; a rotor which is fixed to the distal treatment section between the distal treatment section and the flexible tube section, and which is configured to rotate to the directions about the axis relative to the flexible tube section; a wire fixing portion which is provided to the rotor or a portion to the distal direction side of the rotor; a first rotating operation wire which has a distal end fixed to the wire fixing portion, and which is configured to be moved by the rotating operation section in an extending direction to rotate the distal treatment section and the rotor in a first rotation direction; and a second rotating operation wire which has a distal end fixed to the wire fixing portion, and which is configured to be moved by the rotating operation section in an extending direction to rotate the distal treatment section and the rotor in a second rotation direction opposite to the first rotation direction, characterized in that the rotor includes a first outer surface spaced apart from the longitudinal directions axis of the flexible tube section by a first distance in radial directions, and a second outer surface spaced apart from the longitudinal directions axis of the flexible tube section by a second distance smaller than the first distance in the radial directions, the first rotating operation wire extends from the wire fixing portion to the first outer surface of the rotor, the second rotating operation wire extends from the wire fixing portion to the second outer surface of the rotor, and the treatment apparatus further includes a wire intersecting portion in which the first rotating operation wire and the second rotating operation wire intersect each other at positions apart from each other in a state that the second rotating operation wire is located on an inner direction side of the first rotating operation wire. a flexible tube section which has a longitudinal directions axis and extends in longitudinal directions; a distal treatment section which is provided to a distal direction side of the flexible tube section, and which is configured to rotate to directions about an axis relative to the flexible tube section; a rotating operation section which is provided to a proximal direction side of the flexible tube section, and which is configured to perform rotating operation of the distal treatment section; a rotor which is fixed to the distal treatment section between the distal treatment section and the flexible tube section, and which is configured to rotate to the directions about the axis relative to the flexible tube section; a wire fixing portion which is provided to the rotor or a portion to the distal direction side of the rotor; a first rotating operation wire which has a distal end fixed to the wire fixing portion, and which is configured to be moved by the rotating operation section in an extending direction to rotate the distal treatment section and the rotor in a first rotation direction; and a second rotating operation wire which has a distal end fixed to the wire fixing portion, and which is configured to be moved by the rotating operation section in an extending direction to rotate the distal treatment section and the rotor in a second rotation direction opposite to the first rotation direction, characterized in that the rotor includes a first outer surface spaced apart from the longitudinal directions axis of the flexible tube section by a first distance in radial directions, and a second outer surface spaced apart from the longitudinal directions axis of the flexible tube section by a second distance smaller than the first distance in the radial directions, the first rotating operation wire extends from the wire fixing portion to the first outer surface of the rotor, the second rotating operation wire extends from the wire fixing portion to the second outer surface of the rotor, and the treatment apparatus further includes a wire intersecting portion in which the first rotating operation wire and the second rotating operation wire intersect each other at positions apart from each other in a state that the second rotating operation wire is located on an inner direction side of the first rotating operation wire.