AIRBAG DEVICE AND PASSENGER PROTECTING DEVICE

An airbag device (30) has an airbag (32). The airbag (32) has a front-rear chamber (34) and an airbag main body (40). The front-rear chamber (34) has a left and right pair of front-rear extending portions (34A) that pass by respective left and right sides of a head (H) of a passenger (P) seated in a vehicle seat (12) and inflate and deploy toward the seat front side, and a connecting portion (34B) connecting front end portions of the pair of front-rear extending portions (34A) in a seat left-right direction. The airbag main body (40) inflates and deploys toward the passenger at a seat rear side of the connecting portion (34B), later than the front-rear chamber (34). At a time when the passenger is restrained, the airbag main body (40) is compressed in a seat front-rear direction while stretching the front-rear chamber (34) in the seat front-rear direction.