A vehicle occupant protection system includes: an outside airbag; reinforcement cloths that are attached to a reverse surface of a seat cover, in a region at a the vehicle width direction outer side, and a region at a seat front side, of the outside airbag, the reinforcement cloths being attached from an outside splitting portion; an inside airbag; webbings that are secured to a side frame (a frame) of a seat back, with each having an end portion fastened to an inside splitting portion; an outside inflator that supplies a gas for inflation to the seat outside airbag; an inside inflator that supplies a gas for inflation to the seat inside airbag; and a control unit which, at a time of a side crash, actuates the inside inflator later than the outside inflator.