An operation apparatus for performing an operation by steering an end effector includes a wire which is connected to the end effector to steer the end effector, and a tension compensator which is connected with the wire, wherein in an operating state, the tension compensator changes a shape or position in response to tension of the wire to keep the wire tight, and when the wire is pulled to steer the end effector, the tension compensator is shifted to a lock state in which the shape or position is not changed.