Heat-resistant magnesium alloy

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The present invention aims at obtaining an Al-Mn magnesium alloy excellent in heat resistance and excellent in the balance of mechanical strengths while ensuring creep resistance. The magnesium alloy of the present invention is a magnesium alloy containing, in atomic percent : 5.7 at.% or more and 8.6 at.% or less of Al; 0.6 at.% or more and 1.7 at.% or less of Ca; 0.05 at.% or more and 0.27 at.% or less of Mn; and 0.02 at.% or more and 0.36 at.% or less of a rare earth element (RE); and any one of 0.1 at.% or more and 0.3 at.% or less of Zn and 0.02 at.% or more and 0.18 at.% or less of Sn, wherein the contents in atomic percent satisfy the condition of the inequality of the following Formula (1), and the balance is Mg and inevitable impurities. Ca + RE / A 1 > 0.137