To suppress a change in the reaction force property of a suspension device, concerning improvement of the suspension device that stores gas and serves as a suspension spring (an air spring).

A vehicle includes a suspension device that includes: an expandable/contractable suspension device body F mounted between a vehicle body and wheels of the vehicle and consisting of an outer tube 1 and an inner tube 2 which is inserted into the outer tube 1 in a retractable manner; and a gas chamber A formed inside the suspension device body F and inflatable/deflatable with the expansion/contraction of the suspension device body F, wherein gas stored in the gas chamber A generates reaction force depending on the expansion/contraction amount of the suspension device body F. A gas supply means 3 is provided for supplying the gas to the gas chamber A to adjust a pressure in the gas chamber A when the pressure in the gas chamber A is reduced during the travel of the vehicle.