In a seatbelt device, at a time of an emergency of a vehicle, gas is supplied into a tube, and gas within the tube is supplied into a chest bag of a bag, and the chest bag is inflated and expanded. Here, at a time when gas is supplied into the tube, due to the tube being inflated between a webbing and a lower side peripheral surface of an insert-through hole of a tongue, a transverse direction other side portion of the bag is crushed by the tube, and gas that is within the chest bag passing via the transverse direction other side portion of the bag into a waist bag of the bag is limited. Therefore, the chest bag can be inflated and expanded at an early stage.

An airbag for storage at an inner side of the backrest in a vehicle width direction includes a lower folded portion made by folding a lower area of the airbag that is to be situated at a lower side of vehicle upon inflation and deployment, an upper folded portion made by folding an upper area of the airbag that is to be situated at an upper side of vehicle upon the inflation and deployment, and a middle folded portion made by folding a middle area of the airbag that is to be situated between the lower area and the upper area upon the inflation and deployment, wherein the middle folded portion is a roll-folded portion such that a face of the airbag facing away from the inner side upon the inflation and deployment faces inward in the roll-folded portion, the roll-folded portion having the upper folded portion wrapped therein.

The present invention relates to an airbag including an inflating part having gas inflatability, a non-inflating part supporting the inflating part, a combined part constituting a boundary between the inflating part and the non-inflating part, and an ultrasonic fusion bonded part located between the combined part and the end part of an inflator from which a gas at a high pressure spurts when a car crashes, and a preparation method thereof.

An airbag cushion has a plurality of base fabrics and adhesive joints for bonding each of the plurality of base fabrics, wherein the adhesive joint includes a sealing adhesive, a tensile strength (S1) between the base fabric and the adhesive joint is 500 N/5 cm or more, and an application width (L1) and an application thickness (L2) of the adhesive joint satisfy inequality (1): $\begin{array}{cc}L1L250{\mathrm{mm}}^2.& \left(1\right)\end{array}$