A metallic coated steel product including a steel product and a plating layer that is provided on a surface of the steel product and comprises a Zn-Al-Mg alloy layer, wherein, in a cross-section of the Zn-Al-Mg alloy layer, an area fraction of MgZn 2 phase is from 45 to 75%, a total area fraction of MgZn 2 and Al phases is not less than 70%, and an area fraction of Zn-Al-MgZn 2 ternary eutectic structure is from 0 to 5%, and wherein the plating layer has a chemical composition consisting of, by mass: Zn: from more than 44.90% to less than 79.90%; Al: from more than 15% to less than 35%; Mg: from more than 5% to less than 20%; Ca: from 0.1% to less than 3.0%; Si: from 0% to 1.0%; B: from 0% to 0.5%; Y: from 0% to 0.5%; La: from 0% to 0.5%; Ce: from 0% to 0.5%; Cr: from 0% to 0.25%; Ti: from 0% to 0.25%; Ni: from 0% to 0.25%; Co: from 0% to 0.25%; V: from 0% to 0.25%; Nb: from 0% to 0.25%; Cu: from 0% to 0.25%; Mn: from 0% to 0.25%; Sr: from 0% to 0.5%; Sb: from 0% to 0.5%; Pb: from 0% to 0.5%; Sn: from 0% to 20.00%; Bi: from 0% to 2.0%; In: from 0% to 2.0%; Fe: from 0% to 5.0%; and impurities, wherein, provided that an element group A consists of Y, La, and Ce, an element group B consists of Cr, Ti, Ni, Co, V, Nb, Cu, and Mn, an element group C consists of Sr, Sb, and Pb, and an element group D consists of Sn, Bi, and In: a total content of elements selected from the element group A ranges from 0% to 0.5%; a total content of Ca and elements selected from the element group A ranges from 0.1% to less than 3.0%; a total content of elements selected from the element group B ranges from 0% to 0.25%; a total content of elements selected from the element group C ranges from 0% to 0.5%; and a total content of elements selected from the element group D ranges from 0% to 20.00%. wherein, in a cross-section of the Zn-Al-Mg alloy layer, an area fraction of MgZn 2 phase is from 45 to 75%, a total area fraction of MgZn 2 and Al phases is not less than 70%, and an area fraction of Zn-Al-MgZn 2 ternary eutectic structure is from 0 to 5%, and wherein the plating layer has a chemical composition consisting of, by mass: Zn: from more than 44.90% to less than 79.90%; Al: from more than 15% to less than 35%; Mg: from more than 5% to less than 20%; Ca: from 0.1% to less than 3.0%; Si: from 0% to 1.0%; B: from 0% to 0.5%; Y: from 0% to 0.5%; La: from 0% to 0.5%; Ce: from 0% to 0.5%; Cr: from 0% to 0.25%; Ti: from 0% to 0.25%; Ni: from 0% to 0.25%; Co: from 0% to 0.25%; V: from 0% to 0.25%; Nb: from 0% to 0.25%; Cu: from 0% to 0.25%; Mn: from 0% to 0.25%; Sr: from 0% to 0.5%; Sb: from 0% to 0.5%; Pb: from 0% to 0.5%; Sn: from 0% to 20.00%; Bi: from 0% to 2.0%; In: from 0% to 2.0%; Fe: from 0% to 5.0%; and impurities, Zn: from more than 44.90% to less than 79.90%; Al: from more than 15% to less than 35%; Mg: from more than 5% to less than 20%; Ca: from 0.1% to less than 3.0%; Si: from 0% to 1.0%; B: from 0% to 0.5%; Y: from 0% to 0.5%; La: from 0% to 0.5%; Ce: from 0% to 0.5%; Cr: from 0% to 0.25%; Ti: from 0% to 0.25%; Ni: from 0% to 0.25%; Co: from 0% to 0.25%; V: from 0% to 0.25%; Nb: from 0% to 0.25%; Cu: from 0% to 0.25%; Mn: from 0% to 0.25%; Sr: from 0% to 0.5%; Sb: from 0% to 0.5%; Pb: from 0% to 0.5%; Sn: from 0% to 20.00%; Bi: from 0% to 2.0%; In: from 0% to 2.0%; Fe: from 0% to 5.0%; and impurities, wherein, provided that an element group A consists of Y, La, and Ce, an element group B consists of Cr, Ti, Ni, Co, V, Nb, Cu, and Mn, an element group C consists of Sr, Sb, and Pb, and an element group D consists of Sn, Bi, and In: a total content of elements selected from the element group A ranges from 0% to 0.5%; a total content of Ca and elements selected from the element group A ranges from 0.1% to less than 3.0%; a total content of elements selected from the element group B ranges from 0% to 0.25%; a total content of elements selected from the element group C ranges from 0% to 0.5%; and a total content of elements selected from the element group D ranges from 0% to 20.00%. a total content of elements selected from the element group A ranges from 0% to 0.5%; a total content of Ca and elements selected from the element group A ranges from 0.1% to less than 3.0%; a total content of elements selected from the element group B ranges from 0% to 0.25%; a total content of elements selected from the element group C ranges from 0% to 0.5%; and a total content of elements selected from the element group D ranges from 0% to 20.00%.