SIDE AIRBAG APPARATUS

A side airbag apparatus (100, 100A-100G) installed in a vehicle, comprising: a bag shaped cushion (114, 114A) which is housed in a seat back (104, 112) of a vehicle seat (108) and expanded and deployed on the side of the vehicle seat (108) utilizing gas supplied from an inflator (116); and a holding part (128, 138A, 138B, 150, 158, 176, 178, 180) for retaining the shape in the housed state of the cushion (114, 114A); wherein the holding part (128, 138A, 138B, 150, 158, 176, 178, 180) retains the upper part or lower part of the cushion (126, 174) which is folded back to the anterior of the vehicle, and is a flexible cloth material and including a main body part (182A, 182B) which is long shaped in the vertical direction and bag shaped (when the cloth material is sewn), in addition to having a non-sewn part (146, 194, 194A, 194B) which is not sewn, with the cushion (126, 174) capable of being placed from the outside to the inside of the cover member (140B).