A melting apparatus comprising: a melting tank having an outside plate constructed by metal material and a fireproof member covering the outside plate; and a traveling magnetic field generating unit arranged outside the outside plate of the melting tank, generating a magnetic field traveling along the outside plate in the melting tank so as to agitate the molten metal stored in the melting tank, wherein the matter to be melted is introduced into the molten metal stored in the melting tank for melting the matter to be melted, wherein the traveling magnetic field generating unit comprises: a permanent magnet (461a, 461b) facing the sidewall of the melting tank; a support member supporting the permanent magnet (461a, 461b); and a motor rotatively driving the support member centered on a rotational shaft perpendicular to an outer plate surface of the outside plate, wherein a resistance band having larger electric resistance than the metal material constructing the outside plate is formed at a part of the outside plate of the melting tank facing the permanent magnet (461a, 461b), wherein the middle part of the resistance band is arranged at a position in the outside plate of the melting tank facing the rotational shaft, wherein an end of the resistance band is arranged at a position far from the position in the outside plate of the melting tank facing the rotational shaft, and wherein the resistance band is a slot, which is formed in the outside plate of the melting tank and which penetrates the outside plate. a melting tank having an outside plate constructed by metal material and a fireproof member covering the outside plate; and a traveling magnetic field generating unit arranged outside the outside plate of the melting tank, generating a magnetic field traveling along the outside plate in the melting tank so as to agitate the molten metal stored in the melting tank, wherein the matter to be melted is introduced into the molten metal stored in the melting tank for melting the matter to be melted, wherein the traveling magnetic field generating unit comprises: a permanent magnet (461a, 461b) facing the sidewall of the melting tank; a support member supporting the permanent magnet (461a, 461b); and a motor rotatively driving the support member centered on a rotational shaft perpendicular to an outer plate surface of the outside plate, a permanent magnet (461a, 461b) facing the sidewall of the melting tank; a support member supporting the permanent magnet (461a, 461b); and a motor rotatively driving the support member centered on a rotational shaft perpendicular to an outer plate surface of the outside plate, wherein a resistance band having larger electric resistance than the metal material constructing the outside plate is formed at a part of the outside plate of the melting tank facing the permanent magnet (461a, 461b), wherein the middle part of the resistance band is arranged at a position in the outside plate of the melting tank facing the rotational shaft, wherein an end of the resistance band is arranged at a position far from the position in the outside plate of the melting tank facing the rotational shaft, and wherein the resistance band is a slot, which is formed in the outside plate of the melting tank and which penetrates the outside plate.