Electrodeposition Method for Metals

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An objective of the present invention is to provide an electrodeposition method for metals using a molten salt, which easily enables the electrodeposition of various types of metals such as refractory metals and rare earth metals. In order to solve this problem, the invention is characterized in that it is effected at the electrodeposition temperature in a range of from 100° C. to 200° C. using a molten salt of quaternary ammonium halide represented by the general formula (I) below (wherein, in the formula, R1, R2, R3, and R4, which may be the same or different from each other and may have a substituent, each represents an alkyl group having 1 to 12 carbon atoms or a cycloalkyl group having 5 to 7 carbon atoms; and X− represents a halide anion which is a counter-ion of quaternary ammonium cation) and/or a molten salt of pyrrolidinium halide represented by the general formula (II) below (wherein, in the formula, R5 and R6, which may be the same or different from each other and may have a substituent, each represents an alkyl group having 1 to 12 carbon atoms or a cycloalkyl group having 5 to 7 carbon atoms; and X− represents a halide anion which is a counter-ion of pyrrolidinium cation). [in-line-formulae][Chemical 1][/in-line-formulae] [in-line-formulae]R1R2R3R4N+X−  (I)[/in-line-formulae]