Abstract: Disclosed is a seat for vehicle which is pneumatically controlled for a desired body pressure distribution of a person seated in the seat, comprising: a plurality of air bags embedded in a seat; an air pressure source; a single first conduit connected the air pressure source at its one end and branched off into a plurality of second conduits leading to the air bags at its other end; a plurality of on-off valves each provided in the corresponding one of the second conduits leading to the air bags; an exhaust valve connected to the first conduit at its one end and to the atmosphere at its other end; a single pressure sensor provided in the first conduit; and control means connected to the air pressure source, the on-off valves, the exhaust valve and the pressure sensor; the control means comprising means for storing predetermined air pressure values for the air bags, means for selectively opening and closing the on-off valves and the exhaust valve, and means for preventing the valve opening and closing means fo