To provide technique capable of pressurizing the inside of a vessel with stable pressure without hampering workability.

The delivery vehicle holds and conveys a vessel which can house molten metal and can circulate the molten metal between itself and the outside by utilizing a pressure difference. The above vehicle carries at least an engine for travel and carries a generator driven by the engine during traveling or idling of the delivery vehicle by the engine for travel, a gas compressor driven by the electric power generated by the generator and a tank for storing the gas compressed by the gas compressor. An interface section which is disposed at the leading front of an air hose communicating with the tank and is freely attachable and detachable to and from the vessel is connected to the vessel and the inside of the vessel is pressurized through the air hose from the tank such the molten metal housed in the vessel is circulated to the outside.