A seat belt for a vehicle includes a belt webbing with several belt webbing layers and, in a shoulder belt region and a lap belt region, at least one belt interior located between at least two belt webbing layers and to which a gas can be applied. The belt webbing is routed through an opening of a latch plate that can be inserted into a buckle, by means of which latch plate the belt webbing is, if the seat belt is fastened, deflected at a lower deflection point in a transitional region from the lap belt region to the shoulder belt region. A gas passage connecting at least two sections of the belt interior is provided at the lower deflection point between the at least two belt webbing layers. The gas passage is in the form of a tube that is flexible at least in the radial direction.