A vehicle-height control system, comprising: a fluid supply and discharge device comprising (i) a compressor device comprising a compressor and an electric motor configured to drive the compressor, and (ii) a tank configured to store fluid pressurized by the compressor device; a vehicle-height control actuator provided so as to correspond to a wheel and connected to the fluid supply and discharge device; a vehicle height controller configured to control a vehicle height for the wheel by controlling the fluid supply and discharge device to control supply and discharge of fluid to and from the vehicle-height control actuator; a tank pressure controller configured to control a tank pressure which is a pressure of fluid stored in the tank; and a fluid supply controller configured to supply the fluid to a low pressure portion by controlling the fluid supply and discharge device at at least one of start and termination of at least one control of control executed by the vehicle height controller and control executed by the tank pressure controller, wherein the low pressure portion is at least a portion of the fluid supply and discharge device, the fluid supply and discharge device comprising: an intake passage connected to an intake-side portion of the compressor; a discharge passage connected to a discharge-side portion of the compressor; and a first communication interrupter (61, 63, 68t; 62, 64, 68b; 36) provided between the intake passage and the discharge passage and configured to establish communication and isolation between the intake passage and the discharge passage, the intake passage comprising the low pressure portion, the fluid supply controller comprising a closed circuit former configured to control the first communication interrupter (61, 63, 68t; 62, 64, 68b; 36) at at least one of start and termination of the at least one control to form a closed circuit (120; 130; 134) comprising the compressor, the intake passage, and the discharge passage, the vehicle-height control system being characterized in that the closed circuit former comprises a termination closed circuit former configured to form the closed circuit (120; 130; 134) when the compressor device is in an operating state at the termination of the at least one control; and the vehicle-height control system further comprises a motor stopper configured to turn off the electric motor after the closed circuit (120; 130; 134) is formed by the termination closed circuit former. a fluid supply and discharge device comprising (i) a compressor device comprising a compressor and an electric motor configured to drive the compressor, and (ii) a tank configured to store fluid pressurized by the compressor device; a vehicle-height control actuator provided so as to correspond to a wheel and connected to the fluid supply and discharge device; a vehicle height controller configured to control a vehicle height for the wheel by controlling the fluid supply and discharge device to control supply and discharge of fluid to and from the vehicle-height control actuator; a tank pressure controller configured to control a tank pressure which is a pressure of fluid stored in the tank; and a fluid supply controller configured to supply the fluid to a low pressure portion by controlling the fluid supply and discharge device at at least one of start and termination of at least one control of control executed by the vehicle height controller and control executed by the tank pressure controller, wherein the low pressure portion is at least a portion of the fluid supply and discharge device, the fluid supply and discharge device comprising: an intake passage connected to an intake-side portion of the compressor; a discharge passage connected to a discharge-side portion of the compressor; and a first communication interrupter (61, 63, 68t; 62, 64, 68b; 36) provided between the intake passage and the discharge passage and configured to establish communication and isolation between the intake passage and the discharge passage, the intake passage comprising the low pressure portion, the fluid supply controller comprising a closed circuit former configured to control the first communication interrupter (61, 63, 68t; 62, 64, 68b; 36) at at least one of start and termination of the at least one control to form a closed circuit (120; 130; 134) comprising the compressor, the intake passage, and the discharge passage, the vehicle-height control system being characterized in that the closed circuit former comprises a termination closed circuit former configured to form the closed circuit (120; 130; 134) when the compressor device is in an operating state at the termination of the at least one control; and the vehicle-height control system further comprises a motor stopper configured to turn off the electric motor after the closed circuit (120; 130; 134) is formed by the termination closed circuit former.