AIRBAG DEVICE AND METHOD FOR MANUFACTURING AIRBAG DEVICE

To prevent outward gas leakage between the airbag cushion and inflator during expansion and deployment with a simple configuration.The present invention provides an airbag device (4) including:an airbag cushion having at least two panels;an inflator (6) that discharges gas inside the airbag cushion;a first piece (531) extending from an edge of a first panel of the two panels that is folded in the middle into the airbag cushion;a second piece (537) provided on a portion near the edge of a second panel (51) facing the first piece (531) inside the airbag cushion (5) and sewn to the folded part (538) of the folded first piece (531); andan insertion passage (55) for the inflator (6) formed from sewing the folded part (538) and the second piece (537), and extending from inside the airbag cushion to outside.