Side airbag device for rear seat

[0016]A side airbag device for a rear seat relating to a first embodiment is described with reference to FIGS. 1 through 4B. Note that arrow FR that is shown appropriately in these drawings indicates the vehicle forward side, arrow UP indicates the vehicle upward side, and arrow RH indicates the vehicle right side when facing in the advancing direction. Further, in the following explanation, when longitudinal, vertical and left-right directions are used without being specified, they refer to the longitudinal of the vehicle longitudinal direction, the vertical of the vehicle vertical direction, and the left and right when facing in the advancing direction.

[0017]FIG. 1 is a front view in which a rear seat 12, to which a side airbag device 10 for a rear seat relating to the present embodiment is applied, is seen from the vehicle front side. FIG. 2 is a side view in which the rear seat 12 is seen from the transverse direction inner side. A state in which a crash test dummy (a mannequin) is

[0043]In a side airbag device 10 for a rear seat of a second embodiment, the exhaust holes 55 of the peripheral wall at the diffuser 53 are closed-off by sewn portions that are formed so as to be able to break at the time when the pressure of the gas of the inflator 52 rises.

[0044]The exhaust holes 55 of the present embodiment are closed-off by sewn portions that are formed so as to be able to break. The sewn portions are formed such that, when the internal pressure rises due to gas generated from the inflator 52, the sewn portions break when the internal pressure of the diffuser 53 exceeds a predetermined pressure. Due thereto, even in a case in which the internal pressure of the diffuser 53 rises due to the airbag door 42 contacting the head portion H of the vehicle occupant D, the internal pressure of the diffuser 53 can be lowered reliably, and the vehicle occupant D receiving excess load from the airbag door 42 can be suppressed. Further, in the same way as in the first embodiment