PURPOSE: To provide an integrated with safety belt air bag in which a safety belt and an air bag are combined and both members can be housed compactly, and the air bag is made to respond also to an impact in the multiple directions other than a head-on collision, and made to be usable repeatedly, so as to reduce the cost extensively as well as to further increse safety.

CONSTITUTION: An air bag main body 10 is installed on a safety belt 21, and when the safety belt is not used, it is stored together with the air bag main body 10 in a housing space 7 provided at the rear side of a seat having a hollow which is formed by a blowing formation, and when it is used, one end of the safety belt is fixed to the housing space 7, while the other end is connected to a locking part 8 around the door, and the air bag main body 10 is installed on the position to protect the occupant.