A degradable structural member that is made of a magnesium alloy, exhibits a satisfactory strength, and degrades with suitable timing in aqueous environments is produced. The magnesium alloy used contains 7.0-13.0 mass% Al, 4.5-13.0 mass% Cu, and equal to or greater than 0 mass% but less than 0.10 mass% Mn, with the balance being Mg and inequitable impurities, and includes microscopically dispersed intermetallic compounds.
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