A high-strength steel sheet having a tensile strength of 980 MPa or more, measured by a tensile test according JIS Z2241:1998, comprising: a composition containing, in mass%, C: 0.05% to 0.15%, Si: 1.6% or less, Mn: 1.3% to 2.4%, P: 0.05% or less, S: 0.0050% or less, Al: 0.01% to 0.10%, N: 0.010% or less, Ti: 0.005% to 0.10%, B: 0.0002% to 0.004%, and one or two selected from Mo: 0.005% to 0.50% and Cr: 0.005% to 1.0%, optionally one or more selected from V: 0.05% or less, Nb: 0.50% or less, Cu: 0.30% or less, Ni: 0.05% or less, and Ca and/or REM: 0.0050% or less, optionally Ta: 0.01% or less and optionally Mg: 0.01% or less, the balance being Fe and unavoidable impurities, wherein the unavoidable impurities may include antimony (Sb), zinc (Zn), cobalt (Co), tin (Sn) and zirconium (Zr) and the allowable range of their respective contents is Sb: 0.01% or less, Zn: 0.01% or less, Co: 0.10% or less, Sn: 0.10% or less and Zr: 0.10% or less, a multi-phase structure containing, in volume fraction, ferrite of 35% to 65%, residual austenite of 7% or less and including 0%, martensite of 20% to 60%, bainite of 20% or less and including 0%, pearlite of 5% or less and including 0%, wherein the total volume fraction of ferrite, bainite, martensite and residual austenite is 90% or more, the ferrite having an average crystal grain size of 8 μm or less and an average aspect ratio of 3.5 or less, the martensite having an average crystal grain size of 3 μm or less, and the bainite having an average crystal grain size of 3 μm or less when contained; wherein the multi-phase structure properties are measured according to the methods indicated in the description; and a standard deviation of Vickers hardness of the steel sheet being 30 or less, using a test force of 2.942 N and a holding time of 15 seconds, when measured at 200 μm intervals from a position of 100 μm from a surface to a central portion in a thickness direction of the steel sheet, and wherein the steel sheet has a sheet thickness of 0.4 mm or more and 2.4 mm or less. a composition containing, in mass%, C: 0.05% to 0.15%, Si: 1.6% or less, Mn: 1.3% to 2.4%, P: 0.05% or less, S: 0.0050% or less, Al: 0.01% to 0.10%, N: 0.010% or less, Ti: 0.005% to 0.10%, B: 0.0002% to 0.004%, and one or two selected from Mo: 0.005% to 0.50% and Cr: 0.005% to 1.0%, optionally one or more selected from V: 0.05% or less, Nb: 0.50% or less, Cu: 0.30% or less, Ni: 0.05% or less, and Ca and/or REM: 0.0050% or less, optionally Ta: 0.01% or less and optionally Mg: 0.01% or less, the balance being Fe and unavoidable impurities, wherein the unavoidable impurities may include antimony (Sb), zinc (Zn), cobalt (Co), tin (Sn) and zirconium (Zr) and the allowable range of their respective contents is Sb: 0.01% or less, Zn: 0.01% or less, Co: 0.10% or less, Sn: 0.10% or less and Zr: 0.10% or less, a multi-phase structure containing, in volume fraction, ferrite of 35% to 65%, residual austenite of 7% or less and including 0%, martensite of 20% to 60%, bainite of 20% or less and including 0%, pearlite of 5% or less and including 0%, wherein the total volume fraction of ferrite, bainite, martensite and residual austenite is 90% or more, the ferrite having an average crystal grain size of 8 μm or less and an average aspect ratio of 3.5 or less, the martensite having an average crystal grain size of 3 μm or less, and the bainite having an average crystal grain size of 3 μm or less when contained; wherein the multi-phase structure properties are measured according to the methods indicated in the description; and a standard deviation of Vickers hardness of the steel sheet being 30 or less, using a test force of 2.942 N and a holding time of 15 seconds, when measured at 200 μm intervals from a position of 100 μm from a surface to a central portion in a thickness direction of the steel sheet, and wherein the steel sheet has a sheet thickness of 0.4 mm or more and 2.4 mm or less.