A steel sheet comprising, as a chemical composition of the steel, by mass%: C: 0.050% to 0.250%; Si: 0.005% to 2.000%; Mn: 0.10% to 3.00%; P: 0.100% or less; S: 0.0100% or less; sol. Al: 0.001% to 1.00%; Ti: 0.150% to 0.400%; N: 0.0010% to 0.0100%; Nb: 0% to 0.100%; V: 0% to 1.000%; Mo: 0% to 1.000%; Cu: 0% to 1.00%; Ni: 0% to 1.00%; Cr: 0% to 2.00%; W: 0% to 1.000%; B: 0% to 0.0020%; Ca: 0% to 0.0100%; Mg: 0% to 0.0100%; REM: 0% to 0.0100%; and Bi: 0% to 0.0200% with a remainder of Fe and impurities, wherein Ex. C obtained by the following formula is 0.020% or less, a microstructure at a 1/4 depth position of a sheet thickness from a surface contains 60% or more of ferrite, 0% to 5% of MA, wherein the MA being Martensite-Austenite constituents, and a total of 0% to 5% of pearlite and cementite with a remainder of bainite in terms of area fractions, in the microstructure, an average crystal grain diameter is 10.0 μm or less, an average aspect ratio of crystal grains is 0.30 or more, a standard deviation of a Mn concentration is 0.60 mass% or less, a Ti-based carbide having a Baker-Nutting orientation relationship in the ferrite is precipitated in a semi-coherent state, and a tensile strength is 980 MPa or more, wherein the microstructure, the average crystal grain diameter, the average aspect ratio of crystal grains, the standard deviation of the Mn concentration, the Ti-based carbide having a Baker-Nutting orientation relationship in the ferrite, and the tensile strength are measured as described in the description, Ex. C= (%C) - 12{(%Ti*)/48 + (%V)/51 + (%Nb)/93 + (%Mo)/96 + (%W)/184} here, "%Ti*" in the formula is obtained from the following formula, %Ti ∗ = %Ti − 48 × { %N / 14 + %S / 32) %C, %V, %Nb, %Mo, %W, %Ti, %N and %S in the formula and the formula are the amounts of C, V, Nb, Mo, W, Ti, N and S in the steel sheet by mass%. C: 0.050% to 0.250%; Si: 0.005% to 2.000%; Mn: 0.10% to 3.00%; P: 0.100% or less; S: 0.0100% or less; sol. Al: 0.001% to 1.00%; Ti: 0.150% to 0.400%; N: 0.0010% to 0.0100%; Nb: 0% to 0.100%; V: 0% to 1.000%; Mo: 0% to 1.000%; Cu: 0% to 1.00%; Ni: 0% to 1.00%; Cr: 0% to 2.00%; W: 0% to 1.000%; B: 0% to 0.0020%; Ca: 0% to 0.0100%; Mg: 0% to 0.0100%; REM: 0% to 0.0100%; and Bi: 0% to 0.0200% with a remainder of Fe and impurities, wherein Ex. C obtained by the following formula is 0.020% or less, a microstructure at a 1/4 depth position of a sheet thickness from a surface contains 60% or more of ferrite, 0% to 5% of MA, wherein the MA being Martensite-Austenite constituents, and a total of 0% to 5% of pearlite and cementite with a remainder of bainite in terms of area fractions, in the microstructure, an average crystal grain diameter is 10.0 μm or less, an average aspect ratio of crystal grains is 0.30 or more, a standard deviation of a Mn concentration is 0.60 mass% or less, a Ti-based carbide having a Baker-Nutting orientation relationship in the ferrite is precipitated in a semi-coherent state, and a tensile strength is 980 MPa or more, wherein the microstructure, the average crystal grain diameter, the average aspect ratio of crystal grains, the standard deviation of the Mn concentration, the Ti-based carbide having a Baker-Nutting orientation relationship in the ferrite, and the tensile strength are measured as described in the description, Ex. C= (%C) - 12{(%Ti*)/48 + (%V)/51 + (%Nb)/93 + (%Mo)/96 + (%W)/184} here, "%Ti*" in the formula is obtained from the following formula, %Ti ∗ = %Ti − 48 × { %N / 14 + %S / 32) %C, %V, %Nb, %Mo, %W, %Ti, %N and %S in the formula and the formula are the amounts of C, V, Nb, Mo, W, Ti, N and S in the steel sheet by mass%.