Vehicle with a side air bag apparatus

The present invention provides a side air bag apparatus including an air bag unit (40). The air bag unit (40) contains a side air bag (50) and an inflator (70) in its upper and lower portions respectively. The air bag unit (40) is attached to a inner panel (20) of a side door (2) through upper attaching portions (40c,40d) and lower attaching portions (40a,40b). The air bag unit (40) is configured to move in parallel toward a vehicle occupant compartment or to allow a lower portion of said air bag unit to be swingably displaced in larger amount than an upper portion of said air bag unit during a side impact collision by means of a difference in distance between a side impact input position corresponding to a impact bar (22) and each attaching portion (40a,40b,40c,40d), or by means of a difference in the respective attaching strengths of each attaching means to said inner panel (20). This invention enables the side air bag unit to avoid damages during the collision. Further, the side air bag can reliably be expanded between an occupant and the side door. A structure for attaching the air bag unit to the side door can also be simplified.