Head protection air bag apparatus

A head protection air bag apparatus comprises an air bag, an air bag cover for covering the air bag, an inflator for supplying the air bag.with a gas for inflation, and an assist grip. The inflator is fixed to a body of a vehicle at a location toward the exterior side of a vehicle relative to the assist grip. The assist grip is provided on its exterior surface with a cover layer having the characteristic of a cushion, so that an impact with the inflator will be cushioned by the assist grip.