To achieve joining burned metal clay directly with a metal body.

A metal product S is manufactured by jointly brazing burned metal clay B formed by burning metal clay with a metal body M. The manufacturing method is composed of a surface finishing process for polishing the surface of the joint of the burned metal clay B and the metal body M, a flux applying process for applying flux on the surface of at least either of the burned metal clay B or the metal body M, an applying process for applying brazing filler metal on the surface of the joint of at least either one of burned metal clay B or the metal body M, and a heating process for splicing the joints of burned metal clay B and the metal body M with each other, heating this joint by a gas burner, and melting the brazing filler metal.