AIRBAG DEVICE

An airbag device includes: an airbag which inflates from a state of a folded body by receiving an inflation gas; and a wrapping material wraps the folded body. The folded body has a three-dimensional shape including a bottom surface portion, a ceiling portion, and a side surface portion. The wrapping material includes: a cover member having flexibility and a sheet shape which includes a ceiling cover portion covering the ceiling portion of the folded body, a side surface cover portion covering the side surface portion, and a bottom surface cover portion which covers the bottom surface portion and has a locking hole to be locked to a fastener, and an elongation regulating member which is provided on at least a part of the cover member so as to suppress elongation of the cover member in opposition to an acting direction of the restoring force of the folded body.