Vehicle height adjustment apparatus

A vehicle height adjustment apparatus includes a rear wheel suspension spring that is disposed between a vehicle body and a tire wheel of a vehicle; a rear wheel damper that undergoes an extensional and contractional operation so as to move working oil to dampen vibration of the spring; a support member that supports one end portion of the spring, and moves relative to the damper to change the length of the spring; a jack chamber into which the working oil causing the support member to move relative to the damper flows by the extensional and contractional operation of the damper; a rear wheel electromagnetic valve that adjusts the amount of the working oil flowing into the jack chamber by the degree of opening of the electromagnetic valve; and control device that controls the degree of opening of the electromagnetic valve based on a weight exerted on the vehicle.