Hot-dip zn-alloy-plated steel sheet and method for producing same

This hot-dip Zn-alloy-plated steel sheet comprises: a steel sheet; and a hot-dip Zn-alloy-plated layer arranged on a surface of the steel sheet. The entire surface of the hot-dip Zn-alloy-plated layer satisfies the following formula (1): S[Zn(OH)2]/(S[Zn(OH)2]+S[Zn]) * 100 <= 40. In formula (1): S[Zn] is the area exhibited by a peak having a center at approximately 1022 eV ascribable to metallic Zn in an intensity profile in XPS analysis of the surface of the hot-dip Zn-alloy-plated layer; and S[Zn(OH)2] is the area exhibited by a peak having a center at approximately 1023 eV ascribable to Zn(OH)2 in an intensity profile in XPS analysis of the surface of the hot-dip Zn-alloy-plated layer.