To prevent a malfunction of a spray gun due to the solidification of a material to be sprayed.

The spray gun includes a spray port 33 to spray a chocolate supplied in an atomized state, a feed passage 45 to guide and feed the chocolate to the port 33, and a first and second medium passages 46, 47 which are disposed in the passage 45 and in each of which warm water flows. The temperature within the passage 45 is held at a temperature equal to or higher than the melting point of the chocolate by means of warm water flowing through the passages 46, 47 to prevent the chocolate from solidifying.