Gas generator

A gas generator comprising:

• a cylindrical housing constituted of a top plate portion and a bottom plate portion closing axial end portions and a circumferential wall portion provided with a gas discharge opening and containing a combustion chamber accommodating a gas generating agent;
• an igniter charged with an ignition agent for burning the gas generating agent;
• and
• a fixing portion fixing the igniter to the bottom plate portion,
• the bottom plate portion being provided with an opening,
• the igniter including an ignition portion defining an ignition chamber accommodating the ignition agent and a terminal pin connected to the ignition portion for igniting the ignition agent and arranged to pass through the opening,
• the fixing portion being formed from a resin molding provided to close the opening and to fill a space between the igniter and the bottom plate portion,
• the resin molding including an annular wall portion surrounding an outer circumferential surface of the ignition portion, and
• the annular wall portion having a lower cover portion provided as being continuous in a circumferential direction on a side of the bottom plate portion so as to cover the outer circumferential surface of the ignition portion as being secured to the outer circumferential surface of the ignition portion and an upper cover portion provided as being intermittent in the circumferential direction on a side of the top plate portion so as to cover the outer circumferential surface of the ignition portion as being secured to the outer circumferential surface of the ignition portion.