GAS GENERATOR FOR OCCUPANT RESTRAINING DEVICE

The present invention provides a gas generator for a restraining device, including: a housing; an ignition device chamber housing and an outer cylindrical wall portion disposed inside the housing; and an annular partition wall portion forming a space near a top plate between the ignition device chamber housing and the outer cylindrical wall portion, a portion defined by the top plate and a bottom plate of the housing, the ignition device chamber housing and the outer cylindrical wall portion is a combustion chamber charged with a gas generating agent; an inner cylindrical wall portion, disposed on the housing bottom plate and spaced from the annular partition wall portion, is provided inside the combustion chamber; the ignition device chamber and the combustion chamber communicate with each other by a first communication portion; the combustion chamber and the space communicate with each other by a gas-flow hole of the annular partition wall portion; the first communication portion and the inner cylindrical wall portion face each other in the radial direction of the housing; and a combustion product generated in the ignition device chamber passes through the first communication portion, then collides with the inner cylindrical wall portion, changes a flow direction toward the top plate, and passes through the gas-flow hole of the annular partition wall portion.