A vehicle occupant restraint system of the present invention has: a seat belt restraint device (13) including a shoulder belt (11) which restrains the body of a vehicle occupant (C) diagonally from one of the shoulders (Cs) to the chest (Cc), and a lap belt (12) which restrains the waist (Cw) of the vehicle occupant (C); an upper air bag (30) supported by an upper support point (32) provided on the shoulder belt (11); a lower air bag (31) supported by a lower support point (33) provided on the lap belt (12) and coming into contact with the upper air bag (30) in a vertical direction when being inflated and extended; and an air bag movement inhibiting structure (H1 H9). The air bag movement inhibiting structure (H1 H9) applies, to at least one of the upper support point (32) and the lower support point (33), a moment (M1 M13) in a direction of canceling movements of contact surfaces of the upper and lower air bags (30, 31) toward a side in the vehicle width direction, where a part of the shoulder belt (11) is located above the shoulder (Cs) of the vehicle occupant (C), when the upper air bag (30) and the lower air bag (31) receive inertial force of the vehicle occupant (C) toward a front of a vehicle.