High-strength steel sheet and method for manufacturing same

A high-strength steel sheet comprising:

• a chemical composition containing, in mass %,
• C:
• 0.13% or more and less than 0.40%,
• Si:
• 0.01% or more and 1.0% or less,
• Mn:
• 1.7% or less (excluding 0%),
• P:
• 0.030% or less,
• S:
• 0.010% or less,
• Al:
• 0.20% or less (excluding 0%),
• N:
• 0.010% or less, and the balance being Fe and incidental impurities;
• and
• a steel structure in which a total area fraction of martensite and bainite in a position of ¼ of a sheet thickness is 95% or more and 100% or less, the balance in a case where the total area fraction is not 100% contains retained austenite, and an area fraction of ferrite in a region extending up to 10 μm in a sheet thickness direction from a surface is 13% or more and 40% or less,
• wherein a tensile strength is 1320 MPa or more, and
• a Vickers hardness in a position of 15 μm in the sheet thickness direction from the surface satisfies a formula (1) below,
• Hv≥0.294×σ (1)
• where Hv represents a Vickers hardness in the position of 15 μm in the sheet thickness direction from the surface, and a represents a tensile strength (MPa).