Gas generator

A gas generator, comprising:

• a housing;
• an ignition unit disposed in the housing;
• a gas generating agent that is accommodated in a combustion chamber in the housing and that generates a combustion gas upon operation of the ignition unit;
• a discharge port provided in the housing and configured to discharge the combustion gas from the housing;
• and
• a filter disposed so as to oppose the discharge port and extending in an axial direction of the housing, the filter including a first axial end surface and a second axial end surface opposite to the first axial end surface;
• and,
• a partition wall member partitioning a space inside the housing into the combustion chamber accommodating therein the gas generating agent and a filter chamber accommodating therein the filter, the partition wall member including a communication hole allowing the combustion chamber and the filter chamber to be in communication with each other,
• wherein,
• at least an outer peripheral portion on the first axial end surface of the filter is in contact with an inner wall surface of the housing to surround the discharge port,
• a portion that is at least a part of an outer peripheral surface of the filter around an axis of the filter and that extends over the entire circumference is an inflow portion of the combustion gas,
• the inflow portion is disposed to be in communication with the combustion chamber, and
• the second axial end surface of the filter is in contact with the partition wall member.