A vehicle height adjustment device comprising: an outer member and an inner tube, wherein the outer member is disposed on the side of a wheel of a vehicle and the inner tube is disposed on the side of a body of the vehicle; a spring having one end supported at a side of the body of the vehicle and another end supported at the side of the wheel (2, 3) of the vehicle; an adjustor comprising an accommodation chamber capable of accommodating a fluid, the adjustor being configured to adjust a length of the spring in accordance with an amount of the fluid in the accommodation chamber; a storage chamber capable of storing the fluid; a pump comprising a cylinder and being configured to take into the cylinder the fluid stored in the storage chamber when a relative distance between the body and the wheel increases, and configured to discharge the fluid out of the cylinder when the relative distance between the body and the wheel decreases; and a passage switch unit configured to switch among a first state in which the fluid discharged from the pump is guided into the accommodation chamber to increase the amount of the fluid in the accommodation chamber, a second state in which the fluid in the accommodation chamber is guided into the storage chamber to decrease the amount of the fluid in the accommodation chamber, and a third state in which the amount of the fluid in the accommodation chamber is maintained, the passage switch unit being configured to maintain the third state when electric current supplied to the passage switch unit is stopped characterized in that the passage switch unit is mounted on the upper-side end of the cylinder inside the inner tube. an outer member and an inner tube, wherein the outer member is disposed on the side of a wheel of a vehicle and the inner tube is disposed on the side of a body of the vehicle; a spring having one end supported at a side of the body of the vehicle and another end supported at the side of the wheel (2, 3) of the vehicle; an adjustor comprising an accommodation chamber capable of accommodating a fluid, the adjustor being configured to adjust a length of the spring in accordance with an amount of the fluid in the accommodation chamber; a storage chamber capable of storing the fluid; a pump comprising a cylinder and being configured to take into the cylinder the fluid stored in the storage chamber when a relative distance between the body and the wheel increases, and configured to discharge the fluid out of the cylinder when the relative distance between the body and the wheel decreases; and a passage switch unit configured to switch among a first state in which the fluid discharged from the pump is guided into the accommodation chamber to increase the amount of the fluid in the accommodation chamber, a second state in which the fluid in the accommodation chamber is guided into the storage chamber to decrease the amount of the fluid in the accommodation chamber, and a third state in which the amount of the fluid in the accommodation chamber is maintained, the passage switch unit being configured to maintain the third state when electric current supplied to the passage switch unit is stopped characterized in that the passage switch unit is mounted on the upper-side end of the cylinder inside the inner tube.