Magnesium alloy and magnesium alloy member superior in corrosion resistance

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There is provided a magnesium alloy containing mass percent Al : 5% to 7%, Ca : 2% to 4%, Mn : 0.1% to 0.8%, Sr : 0.001% to 0.05% and rare earth elements : 0.1% to 0.6%. If necessary, an allowable content is set in each of Si, Zn, Cu, Ni, Fe and Cl of the unavoidable impurities, with Si not higher than mass percent 0.01%, Zn not higher than mass percent 0.01%, Cu not higher than mass percent 0.008%, Ni not higher than mass percent 0.001%, Fe not higher than mass percent 0.004%, and Cl not higher than mass percent 0.003%. There is also provided a magnesium alloy member injected in the die by using such an alloy.