Patent 9296352 was granted and assigned to Toyota on March, 2016 by the United States Patent and Trademark Office.
A seat back board made from resin is fitted to side frames of a seatback frame from a seat rear side. A seat width direction outer side portion of the seat back board is integrally formed with a case portion that houses a side airbag device that is fixed to an outside face of the side frame. The presence of a side wall portion of the case portion suppresses a side airbag from expanding towards the seatback outside in a ball shape during initial inflation.