There is provided a relay device for relaying first wireless communication and second wireless communication. In one embodiment, one of terminals of the energizer serving as the heater is electrically connected to the lower pole piece, so that a relay terminal for a heating device is used also as the terminal for preventing the corrosion of pole pieces. Thus, the inner ring is tightly fitted to the shaft with a set interference with respect to the shaft. The carrier holder holds a volatile carrier in a location above the fuel burner such that hot gases from the fuel burner pass the carrier holder and directly heat a volatile carrier held thereby.