The present invention provides an apparatus provided with an igniter assembly including: an igniter main body having an ignition portion, provided with an ignition agent, and an electroconductive pin, a resin portion surrounding at least part of the igniter main body and a substantially cylindrical igniter collar fixed to an outer surface of the resin portion, the igniter assembly being disposed in an opening formed in a bottom portion of a housing, the igniter collar of the igniter assembly being fixed to the housing, the igniter collar fixing to the resin portion y deforming the igniter collar so as to engage the igniter collar with a concave portion in the resin portion.