AIR BELT AND AIR BELT DEVICE

It provides an air belt and an air belt device which can absorb impact when inflated, and with which the restraining capability can be improved. The air belt includes a bag 12 which is arranged within a webbing 11 configured to restrain a torso of a passenger 2 and which is supplied with gas during an emergency, the bag 12 includes a main inflating part 12a which is supplied with gas and which is to be inflate and a gas supply channel 12b which is configured to supply the gas to the main inflating part 12a, the main inflating part 12a is configured such that a longitudinal direction inflation width D1 at a shoulder region 21 of the passenger 2 is greater than a longitudinal direction inflation width D2 at a chest region 22 of the passenger 2.