An embodiment of the present invention provides a plated steel material having a plated layer comprising, by weight, 0.5-14% of Al, 0.5-5% of Mg, and the balance of Zn and inevitable impurities, wherein the plated steel material satisfies expression 1 below. [Expression 1] ([Mg]S - [Mg]1/2)/[Mg]1/2 ≥ 0.3 (where, [Mg]S means the Mg content (wt%) in a surface of the plated layer, and [Mg]1/2 means the Mg content (wt%) at 1/2t (t represents the thickness of the plated layer, hereinafter the same) in a thickness direction from a surface of the plated layer.
