Air belt apparatus for motor vehicle

An occupant protection system for a motor vehicle, comprising:

• a webbing for occupant restraint corresponding to a chest portion of an occupant;
• an expansion portion provided in the webbing for occupant restraint, corresponding to a head portion of the occupant seated in a vehicle seat when in expansion;
• an inflator capable of supplying inflation gas into the expansion portion;
• a side collision sensor for detecting or predicting a side collision;
• a control device for activating the inflator on the basis of an output signal from the side collision sensor;
• and
• a belt guide provided on a shoulder portion of a seatback in the vehicle seat, and capable of being developed in a direction to be spaced apart from the head portion up to a predetermined angle limited by means of a stopper mechanism about a fulcrum positioned at an outside in a vehicle-width direction from an ordinary condition in which the webbing for occupant restraint is guided, at a time when the expansion portion is expanded, the belt guide causing the expansion portion to be expanded toward an upper position facing the head portion in the vehicle-width direction while limiting an expanding shape of the expansion portion.