To stop supply of an iron source to a melting chamber in a temperature rising period while smoothly supplying the iron source to the melting chamber in a melting period, in arc melting equipment.

In this arc melting equipment 1 including the melting chamber 2 for melting the iron source 5, a shaft-type preheat chamber 4 provided so as to be directly coupled to the melting chamber to preheat the iron source supplied to the melting chamber, and electrodes 3a, 3b disposed in the melting chamber to melt the iron source supplied to the melting chamber, a pushing-out device 6 for moving the iron source supplied from the preheat chamber to the direction of the melting chamber is disposed at a lower section of the preheat chamber, and an optimum value of a shaft front dimension H to the maximum length A of the iron source is set to satisfy the relationship of A≤H≤4A. When the pushing-out device is driven, the iron source is supplied from the preheat chamber into the melting chamber, and when the driving of the pushing-out device is stopped, the supply of the iron source from the preheat chamber into the melting chamber is stopped.