Leg protection device for vehicle occupant

The object is to provide a leg protection device (1) for vehicle occupant in which an air bag (4) is inflated and deployed along an interior panel (10) in front of a scat (8) with hardly any gap from the interior panel even when the interior panel is convexly curved toward the interior of the car cabin. The air bag (4) is composed of a front panel (24) disposed on an occupant side, and a rear panel (26) disposed on the opposite side. The front panel (24) and the rear panel (26) are substantially rectangular panels, and the length in the longitudinal direction of the front panel (24) is larger by a predetermined length than the length in the longitudinal direction of the rear panel (26). The front panel (24) is sewn with a sewing thread (32) in a state in which the length in the longitudinal direction thereof is substantially equal to the length in the longitudinal direction of the rear panel (26) because of tucked portions (34). When the air bag (4) is inflated, the front panel (24) extends farther than the rear panel (26) in the longitudinal direction, and the rear panel (26) is curved concavely.