Abstract: An air suspension device for a vehicle seat which is capable of automatic adjustment of the height of the seat at a given neutral position. In the device, an air spring is adjusted in flow of air thereinto or therefrom via a directional control valve which is actuated responsive to the vertical movements of link members, so as to adjust the height of the seat. A play is provided in the interlocking relation between the control valve and link members to avoid unnecessary actuation of the valve. Further, a manual control valve is disposed between an air source and the air spring, with a check or shuttle valve provided therein, thereby forming a direct air exhaust circuit, whereby operating the manual valve effects a rapid exhaust of air from the air spring, not via the directional control valve.