Abstract: To provide a method for taking out gas generators readily from waste vehicles and then recovering metallic materials of gas generators taken out efficiently. The method is comprised by a) crushing waste vehicles in which air bag apparatuses are installed by a crushing means so that the crushed pieces have approximately the same size as that of the gas generators themselves and the gas generators themselves can be separated from the air bag apparatuses as single bodies without being substantially crushed; b) taking the gas generators out of the crushed pieces of the waste vehicles; c) charging the gas generators thus taken out into a melting furnace; and d) recovering the metallic materials of the gas generator from the melting furnace.