A manipulator comprises a tube body including a bending portion, a bending wire for a bending drive of the bending portion, a motor including a rotary shaft which rotates in accordance with a drive command signal, a reduction gear unit connected to the rotary shaft and configured by a plurality of gears meshing with each other, a detection unit which detects an operation state of the motor, a storage unit which stores load variation values periodically caused by the meshing of the plurality of gears constituting the reduction gear unit as correction information, a load calculation section which calculates a load exerted on the tube body as a bending load estimated value, and a notifying unit which notifies a calculation result of the load calculation section.