GAS GENERATOR FOR AIR BAG AND AIR BAG DEVICE

The present invention provides a gas generator for an air bag which has a simple structure and is capable of inflating an air bag at an optimal timing and at an optimal developing speed from the time when a gas generator starts actuating. There is provided a gas generator for an air bag in which a gas generating means is stored in a combustion chamber defined in a housing, an orifice member having a plurality of nozzles which are narrowed according to combustion of the gas generating means is provided in a flow path for an activation gas extending from the combustion chamber to a gas discharge port, and a proper combustion pressure is maintained by the orifice member.