Abstract: Provided is an airbag device including an airbag body having a first base fabric and a second base fabric, wherein the first base fabric and the second base fabric have an outer circumferential section and an outer circumferential section that are joined to each other while overlapping each other, a first base fabric joining section formed by joining a plurality of predetermined portions, spaced apart from each other in a circumferential direction of the first base fabric is provided on an outer circumferential side of the first base fabric, and a second base fabric joining section formed by joining a plurality of predetermined portions, spaced apart from each other in a circumferential direction of the second base fabric is provided on an outer circumferential side of the second base fabric.

Abstract: Provided is an airbag device including an airbag body having a first base fabric and a second base fabric, wherein the first base fabric and the second base fabric have an outer circumferential section and an outer circumferential section that are joined to each other while overlapping each other, a first base fabric joining section formed by joining a plurality of predetermined portions, spaced apart from each other in a circumferential direction of the first base fabric is provided on an outer circumferential side of the first base fabric, and a second base fabric joining section formed by joining a plurality of predetermined portions, spaced apart from each other in a circumferential direction of the second base fabric is provided on an outer circumferential side of the second base fabric.

Abstract: An air bag apparatus includes: an inflator that generates a gas when an impact is input; a main bag part that is supplied with the gas from the inflator and is inflated and expanded; a supplementary bag part that is connected to the main bag part and that is supplied with the gas via a plurality of communicating parts from an inside of the main bag part and is inflated and expanded; and a sheet member that is fixed to an inner surface of the supplementary bag part, that covers the entirety of the plurality of communicating parts, and that is formed to be capable of approaching and being separated from a portion between the plurality of communicating parts in the inner surface of the supplementary bag part.