An inflator that supplies gas in the event of a vehicle emergency and a curtain airbag that is inflated and deployed by gas introduction from the inflator are included. The curtain airbag includes an airbag body obtained by sewing a pair of base cloths together. The airbag body has, in the portion in which the gas is introduced from the inflator, a sewn part obtained by sewing a pair of edges of the base cloths. The airbag body further includes a protective cloth sewn to each of the pair of edges along the sewn part such that the sewn part is covered from the inside of the airbag body.