A vehicle with an air bag apparatus (M2, M3) comprising: a moveable lid mounted adjacent an interior upper edge of a vehicle window and adjacent an upper portion of a pillar; an air bag (50, 60) disposed in a folded state at the exterior of the lid and attached to the interior of the vehicle body, the air bag (50, 60) being arranged to push against and open the lid as the air bag (50, 60) deploys, the air bag (50, 60) including a lower edge, an upper edge, and an attachment portion disposed at the upper edge for attachment to the vehicle body; the air bag (50, 60) being folded in a bellows fold so that it is folded substantially in a vertical direction so that the lower edge approaches the upper edge and the attachment portion is attached to the vehicle body so that the air bag (50, 60) is housed behind the lid, a portion of a lower end of the lid being retained by a portion of the interior trim on the pillar, wherein the apparatus (M2, M3) further includes a restraining member disposed at an upper position of the pillar for preventing the air bag (50, 60) from engaging the pillar trim at the time of unfolding and deployment; the restraining member has a substantially L-shaped section including a vertical wall portion and a horizontal wall portion extending from a lower end of the vertical wall portion toward the vehicle's inner side; the vertical wall portion of the restraining member supports an outer side of the airbag (50, 60); the horizontal wall portion supports a lower end surface of the airbag (50, 60); characterized in that a portion of the airbag (50, 60) existing at the position of the restraining member and adjacent the portion of the lower end of the lid retained by the interior trim is folded so that a portion (10i, 51, 62) adjacent the vertical wall portion expands at the beginning of deployment and moves a portion facing the lid toward the lid such that the portion of the airbag (50, 60) adjacent the portion of the lower end of the lid applies a focused and intensified force against the lid relative to general portion of the airbag that deploys downward along a side window glass, wherein the portion (10i, 51, 62) adjacent the vertical wall portion extends to face only the vertical wall portion. a moveable lid mounted adjacent an interior upper edge of a vehicle window and adjacent an upper portion of a pillar; an air bag (50, 60) disposed in a folded state at the exterior of the lid and attached to the interior of the vehicle body, the air bag (50, 60) being arranged to push against and open the lid as the air bag (50, 60) deploys, the air bag (50, 60) including a lower edge, an upper edge, and an attachment portion disposed at the upper edge for attachment to the vehicle body; the air bag (50, 60) being folded in a bellows fold so that it is folded substantially in a vertical direction so that the lower edge approaches the upper edge and the attachment portion is attached to the vehicle body so that the air bag (50, 60) is housed behind the lid, a portion of a lower end of the lid being retained by a portion of the interior trim on the pillar, wherein the apparatus (M2, M3) further includes a restraining member disposed at an upper position of the pillar for preventing the air bag (50, 60) from engaging the pillar trim at the time of unfolding and deployment; the restraining member has a substantially L-shaped section including a vertical wall portion and a horizontal wall portion extending from a lower end of the vertical wall portion toward the vehicle's inner side; the vertical wall portion of the restraining member supports an outer side of the airbag (50, 60); the horizontal wall portion supports a lower end surface of the airbag (50, 60); characterized in that a portion of the airbag (50, 60) existing at the position of the restraining member and adjacent the portion of the lower end of the lid retained by the interior trim is folded so that a portion (10i, 51, 62) adjacent the vertical wall portion expands at the beginning of deployment and moves a portion facing the lid toward the lid such that the portion of the airbag (50, 60) adjacent the portion of the lower end of the lid applies a focused and intensified force against the lid relative to general portion of the airbag that deploys downward along a side window glass, wherein the portion (10i, 51, 62) adjacent the vertical wall portion extends to face only the vertical wall portion.