A vehicle height adjustment apparatus comprising: a spring (110, 210) which connects a vehicle main body of a vehicle and a wheel (14, 21) to each other and expands and contracts in accordance with a weight applied to the vehicle; a damper (120, 220) which damps vibration of the spring (110, 210) by movement of working oil that follows an expansion and contraction operation; a support member (141, 241) which supports one end portion of the spring (110, 210) and moves with respect to the damper (120, 220) to thereby change a length of the spring (110, 210); a working oil chamber (142, 242) into which the working oil, which moves the support member (141, 241) with respect to the damper (120, 220), flows in accordance with the expansion and contraction operation of the damper (120, 220); a solenoid valve (170, 270) which adjusts an amount of working oil that flows into the working oil chamber (142, 242) by an opening degree thereof; an information obtaining device (341, 342) which obtains information related to a vehicle height; and a control device, wherein the control device controls the opening degree of the solenoid valve (170, 270) to allow a movement amount of the support member (141, 241) to reach a movement amount target value that corresponds to the vehicle height set in advance, in accordance with the weight applied to the vehicle, characterized in that the control device controls the opening degree of the solenoid valve (170, 270) to change the movement amount of the support member (141, 241) based on a difference between (i) a value based on the information related to the vehicle height and (ii) a vehicle height-related target value, on condition that the movement amount of the support member (141, 241) reaches the movement amount target value and the value based on the information related to the vehicle height obtained by the information obtaining device (341, 342) does not reach the vehicle height-related target value that corresponds to the vehicle height set in advance. a spring (110, 210) which connects a vehicle main body of a vehicle and a wheel (14, 21) to each other and expands and contracts in accordance with a weight applied to the vehicle; a damper (120, 220) which damps vibration of the spring (110, 210) by movement of working oil that follows an expansion and contraction operation; a support member (141, 241) which supports one end portion of the spring (110, 210) and moves with respect to the damper (120, 220) to thereby change a length of the spring (110, 210); a working oil chamber (142, 242) into which the working oil, which moves the support member (141, 241) with respect to the damper (120, 220), flows in accordance with the expansion and contraction operation of the damper (120, 220); a solenoid valve (170, 270) which adjusts an amount of working oil that flows into the working oil chamber (142, 242) by an opening degree thereof; an information obtaining device (341, 342) which obtains information related to a vehicle height; and a control device, wherein the control device controls the opening degree of the solenoid valve (170, 270) to allow a movement amount of the support member (141, 241) to reach a movement amount target value that corresponds to the vehicle height set in advance, in accordance with the weight applied to the vehicle, characterized in that the control device controls the opening degree of the solenoid valve (170, 270) to change the movement amount of the support member (141, 241) based on a difference between (i) a value based on the information related to the vehicle height and (ii) a vehicle height-related target value, on condition that the movement amount of the support member (141, 241) reaches the movement amount target value and the value based on the information related to the vehicle height obtained by the information obtaining device (341, 342) does not reach the vehicle height-related target value that corresponds to the vehicle height set in advance.