TENSION MEMBER FOR AIRBAG, AND AIRBAG DEVICE

To provide a tension member for an airbag, and an airbag device in each of which the tensile force is controlled continuously with a simple configuration. An airbag device includes an airbag 2 that is normally folded and is inflated and deployed in a case of an emergency, an inflator 3 for supplying gas into the airbag 2, a retainer 4 for retaining the airbag 2 and the inflator 3, and a tension member 5 that controls a shape or a function of the airbag 2 by using tension. The tension member 5 for an airbag includes two end portions 51 connected to respective portions of the airbag 2 that are movable relative to each other when the airbag 2 is inflated and deployed, a widened portion 52 provided between the two end portions 51, and a breaking section 53 provided in the widened portion 52 in such a manner as to extend in a direction of widening of the widened portion 52 and configured to break depending on a magnitude of tension applied between the two end portions 51.