Provided is a manipulator system including: a driver provided at a proximal end of a flexible elongated guide member to drive a distal end of the elongated guide member, a slider that is fixed to the proximal end of the elongated guide member and that is movable with respect to the driver in a longitudinal direction of the elongated guide member, and a controller that is configured to control the driver so as to change a moving amount of the slider in accordance with a bending state of the elongated guide member.