To travel an automobile by liquefied gas (propane gas and the like) expecting safety in a housing in which a liquefied gas cylinder is fixed on the load-carrying platform of the automobile.

A liquefied gas cylinder housing 10 is fixed on the load-carrying platform of an automobile, formed into a box shape by a rear plate 11, both side plates 12a, a bottom plate 13, an upper plate and a front plate 15 which can be opened and closed, and can fix a liquefied gas cylinder through fastening bands 18 whose ends are rotatively attached to the rear plate 11, and at least one exhaust port 25 is arranged in the lower part of any one of the rear plate, both side plates or front plate.