<p>[PROBLEMS] A retainer and inflator that have simple structures, that do not affect productivity, and where gas leakage between the retainer and a filter can be reliably prevented. [MEANS FOR SOLVING PROBLEMS] The plate-like retainer (11) is inserted and placed in a pressure container (2) of the inflator (12) for producing gas to be supplied to an airbag. At the center of inflator (12) is formed a fitting section (11a) fitted to a tube (6) placed in the pressure container (2), and the tube (6) separates ignition means (3) and a gas generation agent (4). At least one pressure release hole (11b) is provided on the outer side of the outer periphery of the fitting section (11a). The retainer has a step (11c) formed at a portion where the outer periphery of the retainer is in contact with the filter (5). [EFFECT] The retainer and inflator do not affect productivity. The retainer has less deformation by combustion pressure when the inflator is activated, and this helps to maintain an intimate contact state between the retainer and the filter.</p>
