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A method which comprises a step of carrying out a molten salt electrolysis in an electrolytic bath, wherein at least one metal compound selected from the group consisting of actinoid compounds and rare earth compounds is molten, by the use of a substrate containing at least one metal selected from the group consisting of Fe, Co and Ni as a cathode; or a method which comprises a step of carrying out a molten salt electrolysis in an electrolytic bath, wherein at least one metal compound selected from the group consisting of actinoid compounds and rare earth compounds and at least one metal compound selected from the group consisting of an Fe compound, a Co compound and an Ni compound are molten. The above method allows the preparation of a thin film even on a substrate which is minute and of a complicated shape.