CURTAIN AIR BAG

PROBLEM TO BE SOLVED: To provide a curtain air bag that prevents the reinforcement cloth from being turned up during gas discharging of a diffuser in a curtain air bag in which reinforcement cloth is arranged in an inner tube.SOLUTION: In the curtain air bag 10 which is composed to supply inflation gas of an inflator 50 through an inner tube 20 to an intermediate part in vehicle cross direction, the inner tube 20 includes a gas introducing part 21 in which the inflator is inserted; and a gas distribution unit 22 which distributes the gas back and forth, further the reinforcement cloth 30 is arranged in inner tube 20, and is connected by sewing to the inner tube 20. A downstream side sewing part 36 of the reinforcement cloth 30 extends up to a sewing end 36c in a position this side of a reinforcement cloth visible outline 34, toward a corner 34b or a bend 34a side rather than the corner 34b out of a reinforcement cloth visible outline 34 at an opposite side of a folded part 33 of the reinforcement cloth 30. With this structure, the reinforcement cloth part ahead of the sewing end 36c is prevented from being turned over.