A high-strength coated steel sheet comprising: a base steel sheet; and a coating layer formed on a surface of the base steel sheet; the base steel sheet including a chemical composition containing, by mass%, C: 0.05% to 0.15%, Si: 0.01% to 1.80%, Mn: 1.8% to 3.2%, P: 0.05% or less, S: 0.02% or less, Al: 0.01% to 2.0%, one or more of B: 0.0001% to 0.005%, Ti: 0.005% to 0.04%, and Mo: 0.03% to 0.50%, optionally, by mass%, one or more of Cr: 1.0% or less, Cu, Ni, Sn, As, Sb, Ca, Mg, Pb, Co, Ta, W, REM, Zn, Nb, V, Cs, and Hf in a total amount of 1% or less, and the balance being Fe and inevitable impurities, and a microstructure, as observed a cross section in a thickness direction perpendicular to a rolling direction, including a martensite phase and a ferrite phase, in which a volume fraction of the martensite phase is 50% to 80%, in which a volume fraction of tempered martensite with respect to the whole martensite phase is 50% or more and 85% or less, in which an average grain diameter of the ferrite phase is 13 μm or less, and in which a volume fraction of ferrite grains having an aspect ratio of 2.0 or less with respect to the whole ferrite phase is 70% or more, wherein the aspect ratios of ferrite grains are determined by etching a portion located at 1/4 of the thickness in a cross section in the thickness direction perpendicular to the rolling direction with a 1-vol% nital solution to expose the microstructure, by taking photographs in 10 fields of view by using a scanning electron microscope at a magnification of 1000 times, and by calculating the ratio of the length in the width direction to the length in the thickness direction as an aspect ratio determined, and wherein yield strength of the high-strength coated steel sheet is 550 MPa or more determined according to standard JIS Z 2241. a base steel sheet; and a coating layer formed on a surface of the base steel sheet; the base steel sheet including a chemical composition containing, by mass%, C: 0.05% to 0.15%, Si: 0.01% to 1.80%, Mn: 1.8% to 3.2%, P: 0.05% or less, S: 0.02% or less, Al: 0.01% to 2.0%, one or more of B: 0.0001% to 0.005%, Ti: 0.005% to 0.04%, and Mo: 0.03% to 0.50%, optionally, by mass%, one or more of Cr: 1.0% or less, Cu, Ni, Sn, As, Sb, Ca, Mg, Pb, Co, Ta, W, REM, Zn, Nb, V, Cs, and Hf in a total amount of 1% or less, and the balance being Fe and inevitable impurities, and C: 0.05% to 0.15%, Si: 0.01% to 1.80%, Mn: 1.8% to 3.2%, P: 0.05% or less, S: 0.02% or less, Al: 0.01% to 2.0%, one or more of B: 0.0001% to 0.005%, Ti: 0.005% to 0.04%, and Mo: 0.03% to 0.50%, optionally, by mass%, one or more of Cr: 1.0% or less, Cu, Ni, Sn, As, Sb, Ca, Mg, Pb, Co, Ta, W, REM, Zn, Nb, V, Cs, and Hf in a total amount of 1% or less, and the balance being Fe and inevitable impurities, and a microstructure, as observed a cross section in a thickness direction perpendicular to a rolling direction, including a martensite phase and a ferrite phase, in which a volume fraction of the martensite phase is 50% to 80%, in which a volume fraction of tempered martensite with respect to the whole martensite phase is 50% or more and 85% or less, in which an average grain diameter of the ferrite phase is 13 μm or less, and in which a volume fraction of ferrite grains having an aspect ratio of 2.0 or less with respect to the whole ferrite phase is 70% or more, wherein the aspect ratios of ferrite grains are determined by etching a portion located at 1/4 of the thickness in a cross section in the thickness direction perpendicular to the rolling direction with a 1-vol% nital solution to expose the microstructure, by taking photographs in 10 fields of view by using a scanning electron microscope at a magnification of 1000 times, and by calculating the ratio of the length in the width direction to the length in the thickness direction as an aspect ratio determined, and wherein yield strength of the high-strength coated steel sheet is 550 MPa or more determined according to standard JIS Z 2241.