A high-strength steel sheet with a tensile strength of 1,180 MPa or more, having a chemical composition containing, on a mass basis, C: 0.150% to 0.350%, Si: 2.0% or less, Mn: 3.50% or less, P: 0.040% or less, S: 0.020% or less, Al: 0.30% to 2.00%, N: 0.010% or less, Ti: 0.50% or less optionally at least one of Nb: 0.2% or less, Cr: 0.50% or less, and Mo: 0.50% or less, and/or at least one of B: 0.0050% or less, Cu: 1.000% or less, Ni: 1.000% or less, Co: 0.020% or less, W: 0.500% or less, Sn: 0.200% or less, Sb: 0.200% or less, V: 0.500% or less, Ca: 0.0050% or less, Mg: 0.0050% or less, and a REM: 0.0050% or less, and a remainder being Fe and incidental impurities, and a steel microstructure in which an area fraction of ferrite is 5% or less, an area fraction of martensite is 2% to 10%, an area fraction of bainite is 5% to 37%, an area fraction of tempered martensite is 42% to 65%, a volume fraction of retained austenite is 3% to 15%, an average grain size of ferrite and bainite is 3 μm or less, in a region extending 50 μm from a surface of the steel sheet in a through-thickness direction, an average grain size of prior austenite grains is 10 μm or less, the average grain size of the prior austenite grains in the through-thickness direction is 0.9 or less of the average grain size thereof in a rolling direction, 80% or less of grain boundaries of the prior austenite grains are high-angle grain boundaries with a misorientation of 15° or more, and in a region extending 200 μm from the surface of the steel sheet in the through-thickness direction, an average size of precipitates is 1.0 μm or less, the average grain size of the prior austenite grains is 15 μm or less, the average grain size of the prior austenite grains in the through-thickness direction is 0.9 or less of the average grain size thereof in the rolling direction, the tensile strength, the area fractions, the volume fraction of retained austenite, the grain sizes, and the proportion of the boundaries of the prior austenite grains that are high-angle grain boundaries with a misorientation of 15° or more are measured according to the respective methods disclosed in the description, and the area fractions of ferrite, martensite, bainite, and tempered martensite, the volume fraction of retained austenite, and the average grain size of ferrite and bainite are measured at a position corresponding to one-fourth of the thickness of a steel sheet. a chemical composition containing, on a mass basis, C: 0.150% to 0.350%, Si: 2.0% or less, Mn: 3.50% or less, P: 0.040% or less, S: 0.020% or less, Al: 0.30% to 2.00%, N: 0.010% or less, Ti: 0.50% or less optionally at least one of Nb: 0.2% or less, Cr: 0.50% or less, and Mo: 0.50% or less, and/or at least one of B: 0.0050% or less, Cu: 1.000% or less, Ni: 1.000% or less, Co: 0.020% or less, W: 0.500% or less, Sn: 0.200% or less, Sb: 0.200% or less, V: 0.500% or less, Ca: 0.0050% or less, Mg: 0.0050% or less, and a REM: 0.0050% or less, and a remainder being Fe and incidental impurities, and a steel microstructure in which an area fraction of ferrite is 5% or less, an area fraction of martensite is 2% to 10%, an area fraction of bainite is 5% to 37%, an area fraction of tempered martensite is 42% to 65%, a volume fraction of retained austenite is 3% to 15%, an average grain size of ferrite and bainite is 3 μm or less, in a region extending 50 μm from a surface of the steel sheet in a through-thickness direction, an average grain size of prior austenite grains is 10 μm or less, the average grain size of the prior austenite grains in the through-thickness direction is 0.9 or less of the average grain size thereof in a rolling direction, 80% or less of grain boundaries of the prior austenite grains are high-angle grain boundaries with a misorientation of 15° or more, and in a region extending 200 μm from the surface of the steel sheet in the through-thickness direction, an average size of precipitates is 1.0 μm or less, the average grain size of the prior austenite grains is 15 μm or less, the average grain size of the prior austenite grains in the through-thickness direction is 0.9 or less of the average grain size thereof in the rolling direction, the tensile strength, the area fractions, the volume fraction of retained austenite, the grain sizes, and the proportion of the boundaries of the prior austenite grains that are high-angle grain boundaries with a misorientation of 15° or more are measured according to the respective methods disclosed in the description, and the area fractions of ferrite, martensite, bainite, and tempered martensite, the volume fraction of retained austenite, and the average grain size of ferrite and bainite are measured at a position corresponding to one-fourth of the thickness of a steel sheet.