The present invention provides methods for: producing high-purity ferroboron by using inexpensive mass-produced steel as a base iron; and producing a mother alloy for an iron-base amorphous alloy and an iron-base amorphous alloy, the alloys having excellent properties, by using the ferroboron thus produced as a raw material. The methods include: a method for producing high-purity ferroboron by using mass-produced steel obtained through a converter, an electric furnace or the like and having an Al content of 0.03 mass % or less as a base iron; a method for producing a mother alloy by adjusting the chemical composition thereof by adding a diluent base iron and auxiliary materials to the produced ferroboron; and a method for producing an iron-base amorphous alloy by preferably using mass-produced steel obtained through a converter or an electric furnace and having an Al content of 0.006 mass % or less as a diluent base iron and by casting the molten metal of the produced mother alloy through a rapid-cooling solidification process. Further, by the present invention, it is possible to economically produce an iron-base amorphous alloy thin strip for an iron core having excellent magnetic properties including a high magnetic flux density and a low core loss by using mass-produced steel having an adequate Al content as both a base iron for ferroboron and a diluent base iron for a mother alloy.
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