A high-strength steel sheet comprising: a component composition including: by mass%, 0.030% to 0.250% of C; 0.01% to 2.00% of Si; 2.00% or more and less than 3.10% of Mn; 0.001% to 0.100% of P; 0.0001% to 0.0200% of S; 0.0005% to 0.0100% of N; 0.001% to 1.200% of Al; optionally one or more of 0.002% to 0.200% of Ti; 0.005% to 0.200% of Nb; 0.005% to 0.500% of V; 0.0005% to 0.500% of W; 0.0003% to 0.0050% of B; 0.005% to 1.000% of Cr; 0.005% to 1.000% of Ni; 0.005% to 1.000% of Mo; 0.005% to 1.000% of Cu; 0.002% to 0.200% of Sn; 0.002% to 0.200% of Sb; 0.001% to 0.100% of Ta; 0.0005% to 0.0050% of Zr; 0.0005% to 0.0050% of Ca; 0.0005% to 0.0050% of Mg; and 0.0005% to 0.0050% of REM; and the balance Fe and inevitable impurities; and a steel structure with: in terms of area fraction, 60.0% or more and less than 90.0% of ferrite, 0% or more and less than 5.0% of unrecrystallized ferrite, 2.0% to 25.0% of martensite, 0% to 5.0% of carbide, and 0% to 3.0% of bainite; in terms of volume fraction, more than 7.0% of retained austenite; in a cross-sectional view of 100 um × 100 μm, a value obtained by dividing number of retained austenite that are not adjacent to retained austenite whose crystal orientations are different by a total number of retained austenite being less than 0.80, an average crystal grain size of the ferrite being 6.0 um or less, an average crystal grain size of the retained austenite being 3.0 μm or less, and a value obtained by dividing an average content, by mass%, of Mn in the retained austenite by an average content, by mass%, of Mn in steel being 1.50 or more. a component composition including: by mass%, 0.030% to 0.250% of C; 0.01% to 2.00% of Si; 2.00% or more and less than 3.10% of Mn; 0.001% to 0.100% of P; 0.0001% to 0.0200% of S; 0.0005% to 0.0100% of N; 0.001% to 1.200% of Al; optionally one or more of 0.002% to 0.200% of Ti; 0.005% to 0.200% of Nb; 0.005% to 0.500% of V; 0.0005% to 0.500% of W; 0.0003% to 0.0050% of B; 0.005% to 1.000% of Cr; 0.005% to 1.000% of Ni; 0.005% to 1.000% of Mo; 0.005% to 1.000% of Cu; 0.002% to 0.200% of Sn; 0.002% to 0.200% of Sb; 0.001% to 0.100% of Ta; 0.0005% to 0.0050% of Zr; 0.0005% to 0.0050% of Ca; 0.0005% to 0.0050% of Mg; and 0.0005% to 0.0050% of REM; and the balance Fe and inevitable impurities; and a steel structure with: in terms of area fraction, 60.0% or more and less than 90.0% of ferrite, 0% or more and less than 5.0% of unrecrystallized ferrite, 2.0% to 25.0% of martensite, 0% to 5.0% of carbide, and 0% to 3.0% of bainite; in terms of volume fraction, more than 7.0% of retained austenite; in a cross-sectional view of 100 um × 100 μm, a value obtained by dividing number of retained austenite that are not adjacent to retained austenite whose crystal orientations are different by a total number of retained austenite being less than 0.80, an average crystal grain size of the ferrite being 6.0 um or less, an average crystal grain size of the retained austenite being 3.0 μm or less, and a value obtained by dividing an average content, by mass%, of Mn in the retained austenite by an average content, by mass%, of Mn in steel being 1.50 or more. in terms of area fraction, 60.0% or more and less than 90.0% of ferrite, 0% or more and less than 5.0% of unrecrystallized ferrite, 2.0% to 25.0% of martensite, 0% to 5.0% of carbide, and 0% to 3.0% of bainite; in terms of volume fraction, more than 7.0% of retained austenite; in a cross-sectional view of 100 um × 100 μm, a value obtained by dividing number of retained austenite that are not adjacent to retained austenite whose crystal orientations are different by a total number of retained austenite being less than 0.80, an average crystal grain size of the ferrite being 6.0 um or less, an average crystal grain size of the retained austenite being 3.0 μm or less, and a value obtained by dividing an average content, by mass%, of Mn in the retained austenite by an average content, by mass%, of Mn in steel being 1.50 or more.