METHOD FOR MANUFACTURING METAL ALLOY MOLDING, METHOD FOR MANUFACTURING METAL ALLOY COMPONENT, AND METAL ALLOY MOLDING DEVICE

PROBLEM TO BE SOLVED: To improve formability and production efficiency of a metal alloy molding in a method for manufacturing the metal alloy molding.SOLUTION: The method for manufacturing the metal alloy molding includes: a metal alloy arrangement step (S1) for arranging a metal alloy on a hearth arranged to mutually separate a plurality of cavities; a dissolving step (S2) for dissolving the metal alloy by being arc-discharged on an arc irradiation region set on a region including an arrangement position of the metal alloy; a molten metal filling step (S3 and the like) for relatively moving the cavities to the arc irradiation region and filling the cavities with metal alloy molten metal by using a filling member contacted on the dissolved metal alloy molten metal; and a solidifying step (S4 and the like) for relatively moving filled cavities to the outside of the arc irradiation region and solidifying the metal alloy molten metal. The metal alloy molding is manufactured by sequentially repeating the molten metal filling step and the solidifying step for the pluralities of the cavities.