AIRBAG DEVICE FOR A PASSENGER SEAT

An airbag body includes, in a protection region disposed in the rear portion, a front-collision arresting plane, an oblique-collision arresting plane, and an arresting recess that is recessed forward between the front-collision arresting plane and oblique-collision arresting plane. The airbag body further internally includes a tether that pulls a flat surfaced portion of the passenger protection region and forms the arresting recess out of the flat surfaced portion at airbag deployment. The tether includes a front-rear connecting region that connects a leading end of the arresting recess to the center of a front end portion of the airbag body, and a sideways connecting region that connects the leading end of the arresting recess to a side wall of the airbag body near the oblique-collision arresting plane. The joint of the sideways connecting region to the side wall is disposed farther forward than the leading end of the arresting recess.