be used the location at which the explosion residue collecting chamber is disposed is not restricted to those shown in the drawings but may be selected at any portion of the passage of the high pressure gas flow at which the direction of the gas flow is abruptly changed further the source of high pressure gas is not restricted to the high pressure gas bomb or container such as shown in the drawings any suitable high pressure gas sources such as of a hybrid type may be equally employed so far as they can produce a high pressure gas at the time of the emergency besides a diffuser provided with a filter may be effectively used if desired without involving the clogging of the filter mesh whereby an improved bag inflation characteristic can be attained as will be appreciated from the foregoing description there is provided according to the present invention a protection inflatable bag apparatus in which the inflatable bag is inflated by a high pressure gas blown thereinto through a diffuser from a gas container and which has an explosion residue collector chamber for collecting explosion residues produced upon the actuation of the apparatus the collecting chamber being disposed.