To provide an air bag device capable of regulating inflation pressure in an air bag according to an inflating developing process of the air bag.

The air bad device is equipped with an air bag 1 in a folded bag shape, and an inflator 2 for supplying gas for inflation to the air bag 1. The air bag 1 has a vent hole 1d capable of discharging the gas for inflation to the outside of the air bag 1, and a restricting member whose one end side is connected to a periphery of the vent hole 1d in the air bag 1, and whose other end side is extended to the outside of the air bag in an non-inflated state, which is coupled to the inside of the air bag 1 by a control member 3b, and pulled into the air bag 1 by the inflation of the air bag 1 so as to restrict the exhaust air of the vent hole 1d.