Gas generator

A gas generator, comprising:

• a housing having a top plate, a bottom plate located axially opposite to the top plate, and a circumferential wall located between the top plate and the bottom plate and provided with a gas discharge port;
• a partition wall provided with a first communication hole including a single through hole, the partition wall being radially disposed in the housing to partition an interior of the housing into a first combustion chamber on a side of the top plate, which accommodates a first gas generating agent, and a second combustion chamber on a side of the bottom plate, which accommodates a second gas generating agent;
• a first igniter for burning the first gas generating agent and a second igniter for burning the second gas generating agent, the first and second igniters being attached to the bottom plate;
• a cylindrical guide member being disposed between the first igniter and the first communication hole of the partition wall and provided with a second communication hole in a cylindrical wall thereof,
• the cylindrical guide member being disposed so as to enclose the first igniter, such that a first end opening thereof is located on the side of the bottom plate and a second end opening thereof is connected to the first communication hole of the partition wall,
• the second end opening or the first communication hole being closed by a first closing member in a state where the second end opening or the first communication hole faces the first combustion chamber, the second communication hole being closed by a second closing member in a state where the second communication hole faces the second combustion chamber, and a rupturing pressure of the first closing member being set lower than a rupturing pressure of the second closing member.