A surface-treated steel sheet comprising a base material and a plating layer formed on a surface of the base material, wherein the average composition of the plating layer is 0.5% to 2.0% by mass of Mg, A surface-treated steel sheet that satisfies [60.0 ≦ Zn + Al ≦ 98.0], [0.4 ≦ Zn / Al ≦ 1.5] and [Zn / Al × Mg ≦ 1.6].
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