To provide a piping device for supplying molten metal, with which even when the molten metal is cooled and solidified in the piping by the breaking of wire in a winding heater, the molten metal can be continued to supply without stopping the device and also, the maintenance of the piping can be carried out, and further, when such trouble is developed as to stop the molten metal flow caused by the air pressure because the air is left in the piping, this device can immediately be kept up with such trouble.

Plural molten metal supplying pipes 4 and 5 with heaters are arranged in parallel, and at both end positions of the respective molten metal supplying pipes 4 and 5, switch valves 4A, 4B, 5A and 5B for shutting off the molten metal flow are arranged and also, in this molten metal supplying piping device, air exhaust valves 4C and 5C are communicatively arranged on the way of the piping in the respective molten metal supplying pipes 4 and 5.