A housing that houses a fuel cell system including: a hydrogen storage unit; a fuel cell stack that generates electric power using hydrogen supplied from the hydrogen storage unit; a pipe that connects the hydrogen storage unit and the fuel cell stack; and a power storage unit, the housing includes: an upper surface portion; a plurality of side surface portions; a ventilation hole, provided with the upper surface portion, configured to ventilate an inside and an outside of the housing; a ventilation hole, provided with a side surface portion of the plurality of side surface portions, configured to ventilate the inside and the outside of the housing; and an air supply device configured to discharge air taken in through one ventilation hole of the ventilation hole of the upper face portion and the ventilation hole of the side face portion from the other ventilation hole.