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A magnesium alloy is provided which does not contain a rare earth and which achieves, in a high-temperature region of about 200° C., both satisfactory mechanical properties and thermal conductivity. A magnesium alloy including Mg, Ca, Al and Si, where a content of Ca is less than 9.0 mass %, a content of Al is equal to or snore than 0.5 mass % but less than 5.7 mass %, a content of Si is equal to or less than 1.3 mass % and Al+8Ca≧20.5%.