Abstract: A gas generator for air bags including a housing (3) defined by a side cylinder (1b) having a plurality of gas outflowing holes (10) and an upper cover (1a) and a lower cover (2a) for closing ends of the side cylinder (1b); an igniter (4), a gas generating agent (6) and a cooling filter member (8) disposed in this order in the housing (3) from a center thereof toward a radially outward side thereof; and a metallic foil (11) disposed on an inner wall surface of the side cylinder (1b) to cover the gas outflowing holes (10) from inside. The cooling filter member (8) extends from the upper cover (1a) to the lower cover (2a). The cooling filter member (8) is cylindrical in shape and has a thick walled portion (8a) formed on an outside diameter side on an end axially opposite to the gas outflowing holes (10), and the thick walled portion (8a) is press fitted into an inner surface of the housing (3).

Abstract: A squib for a gas generator, comprising a magazine which is formed with a squib cup and a squib plug and is sealed; a pair of electrode lead pins penetrating through said squib plug to said magazine; a bearing wire connected to ends of said electrode lead pins; and an explosive contained in said magazine, said explosive composition containing a spontaneous firing explosive composition comprising carbohydrates, oxohalogenates and metal oxides.