A magnesium alloy sheet made of a magnesium-based alloy contains, by mass percentage, Al: 5.0% or more and 6.5% or less, Sr: 0.2% or more and 1.0% or less, Zn: 0.1% or more and 0.75% or less and Mn: 0.1% or more and 0.5% or less, the rest being magnesium and accidental impurities.
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