AIRBAG DEVICE

An airbag device includes a first chamber configured to be deployed in a shape that surrounds a first side and a front side of a seat, a second chamber configured to be deployed in a shape that surrounds a second side and the front side of the seat and fastened to the first chamber at a first portion at which the second chamber overlaps the first chamber, and side tethers connected to one of or both of a second portion between the first chamber of an airbag module embedded at first side of a seatback and a third portion between the second chamber of an airbag module embedded at the second side of the seatback.