A steel sheet having a chemical composition comprising, by mass%, C: 0.05 to 0.40%, Si: 0.2 to 3.0%, Mn: 0.1 to 5.0%, sol. Al: 0 to less than 0.4000%, P: 0.0300% or less, S: 0.0300% or less, N: 0.0100% or less, B: 0 to 0.010%, Ti: 0 to 0.150%, Nb: 0 to 0.150%, V: 0 to 0.150%, Cr: 0 to 2.00%, Ni: 0 to 2.00%, Cu: 0 to 2.00%, Mo: 0 to 1.00%, W: 0 to 1.00%, Ca: 0 to 0.100%, Mg: 0 to 0.100%, Zr: 0 to 0.100%, Hf: 0 to 0.100%, REM: 0 to 0.100% and a balance of Fe and impurities, wherein a surface layer of the steel sheet contains granular oxides, an average grain size of the granular oxides is 300 nm or less, a number density of the granular oxides is 4.0/μm 2 or more, wherein "granular oxides" mean oxides dispersed as grains inside the crystal grains of the steel or on the crystal grain boundaries and "granular" means being present away from each other mutually in the steel matrix, having a 1.0 to 5.0 aspect ratio, the steel sheet comprises an Si-Mn depleted layer having a thickness of 3.0 μm or more from the surface of the steel sheet, wherein the thickness of the Si-Mn depleted layer means the distance from the surface of the steel sheet to the furthest position where an internal oxide is present when proceeding from the surface of the steel sheet, or in the case of a plated steel sheet, the interface of the steel sheet and plating layer, in the thickness direction of the steel sheet, i.e., direction vertical to the surface of the steel sheet, and Si and Mn contents of the Si-Mn depleted layer at 1/2 position of the thickness and not containing oxides are respectively less than 10% of the Si and Mn contents at a sheet thickness center part of the steel sheet, wherein the average grain size of the granular oxides, the number density of the granular oxides, the thickness of the Si-Mn depleted layer and the Si and Mn contents are determined in accordance with the description. C: 0.05 to 0.40%, Si: 0.2 to 3.0%, Mn: 0.1 to 5.0%, sol. Al: 0 to less than 0.4000%, P: 0.0300% or less, S: 0.0300% or less, N: 0.0100% or less, B: 0 to 0.010%, Ti: 0 to 0.150%, Nb: 0 to 0.150%, V: 0 to 0.150%, Cr: 0 to 2.00%, Ni: 0 to 2.00%, Cu: 0 to 2.00%, Mo: 0 to 1.00%, W: 0 to 1.00%, Ca: 0 to 0.100%, Mg: 0 to 0.100%, Zr: 0 to 0.100%, Hf: 0 to 0.100%, REM: 0 to 0.100% and a balance of Fe and impurities, wherein a surface layer of the steel sheet contains granular oxides, an average grain size of the granular oxides is 300 nm or less, a number density of the granular oxides is 4.0/μm 2 or more, wherein "granular oxides" mean oxides dispersed as grains inside the crystal grains of the steel or on the crystal grain boundaries and "granular" means being present away from each other mutually in the steel matrix, having a 1.0 to 5.0 aspect ratio, the steel sheet comprises an Si-Mn depleted layer having a thickness of 3.0 μm or more from the surface of the steel sheet, wherein the thickness of the Si-Mn depleted layer means the distance from the surface of the steel sheet to the furthest position where an internal oxide is present when proceeding from the surface of the steel sheet, or in the case of a plated steel sheet, the interface of the steel sheet and plating layer, in the thickness direction of the steel sheet, i.e., direction vertical to the surface of the steel sheet, and Si and Mn contents of the Si-Mn depleted layer at 1/2 position of the thickness and not containing oxides are respectively less than 10% of the Si and Mn contents at a sheet thickness center part of the steel sheet, wherein the average grain size of the granular oxides, the number density of the granular oxides, the thickness of the Si-Mn depleted layer and the Si and Mn contents are determined in accordance with the description.