A vehicular occupant restraint system is provided with an airbag and an inflator. A front end of the folded airbag is housed within a front pillar garnish covering a side face on the occupant compartment side of a front pillar, and impact absorbing ribs are formed on the inner face of the front pillar garnish only in a section(s) that receives little deformation when the airbag is deployed. Since the front pillar garnish can be easily flexed when the air bag is deployed, there is neither inhibition to the smooth deployment of the airbag nor splitting and scattering of a part of the front pillar garnish. Moreover, since the impact absorbing ribs are formed on the front pillar garnish in the section(s) that receives little deformation, the impact of a secondary collision to an occupant can be absorbed effectively by the impact absorbing ribs.