An actuator system 10 including a drive section 13 that performs driving by injection/suction of a liquid, a tube 12, a syringe pump 11 that injects/suctions the liquid into/from the drive section 13 via the tube 12, a pressure sensor 14 that measures an inner pressure, a storage section 56 that preliminarily stores a volume change ΔV of the tube 12 caused by the inner pressure, and a control section 57 that controls the syringe pump 11 based on the volume change ΔV, inner pressure P, and volume V0 of the liquid injected/suctioned into/from the drive section 13.
