HEAT-RESISTANT MAGNESIUM ALLOY

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An object of the invention in the present application is to obtain an Al-Mn magnesium alloy that has excellent heat resistance and ensures creep resistance while having excellent mechanical strength balance. A magnesium alloy of the invention in the present application contains, by atomic ratio, 5.7-8.6 at.%, inclusive, of Al, 0.6-1.7 at.%, inclusive, of Ca, 0.05-0.27 at.%, inclusive, of Mn, and 0.02-0.3 at.%, inclusive, of a rare earth element (RE), and further contains either 0.1-0.3 at.%, inclusive, of Zn or 0.02-0.18 at.%, inclusive, of Sn, wherein the content by atomic number satisfies the conditions of the inequality in formula (1) and the balance is Mg and inevitable impurities. (Ca+RE)/Al > 0.137 …… (1)