The present invention provides an igniter assembly in which an igniter having an ignition portion and an electroconductive pin, and a metallic igniter retaining member are integrated with a resin molded article interposed therebetween, the igniter assembly, including:a connector insertion space formed by the resin molded article, the electroconductive pin being protruding from the resin molded article and located in the connector insertion space;a spark member including,a first end connected to the metallic igniter retaining member, anda second end, opposite to the first end, located inside the connector insertion space; andan electrically insulating partition wall having a thickness of 0.1 mm to 1 mm, provided with no through hole, and interposed between a root portion of the electroconductive pin, which is in contact with the resin molded article, and the second end of the spark member.