A grain-oriented electrical steel sheet which does not have an inorganic coating containing forsterite as a main component, comprising: a base steel sheet; a silicon-containing oxide layer provided on the base steel sheet; an iron-based oxide layer provided on the silicon-containing oxide layer; and a tension-insulation coating provided on the iron-based oxide layer, having a thickness of 1 to 3 μm, and containing phosphate and colloidal silica as main components; wherein the base steel sheet contains, as chemical components, in terms of mass%, 2.5 to 4.5% of Si, 0.05 to 1.00% of Mn, 0% or more and less than 0.05% of Al, 0% or more and less than 0.1% of C, 0% or more and less than 0.05% of N, 0% or more and less than 0.1% of S, 0% or more and less than 0.05% of Se and 0% or more and less than 0.01% of Bi, and the remainder: Fe and impurities, wherein in an elemental analysis performed from a surface of the tension-insulation coating in a sheet thickness direction by glow discharge optical emission spectrometry as described in the description: (a) in a profile of a Si light emission intensity, there are four or more inflection points; (b) in the sheet thickness direction, the inflection point of the Si light emission intensity present closest to the base steel sheet side is present within a range of 0.3 to 1.5 μm toward the side of the surface of the tension-insulation coating from a saturation point at which an Fe light emission intensity is a maximum, and (c) a peak of the Si light emission intensity present closest to the base steel sheet side has a light emission intensity that is 1.3 times or more and 2.0 times or less the Si light emission intensity in the base steel sheet; and wherein the thickness of the iron-based oxide layer is within a range of 100 to 500 nm, measured by the method described in the description. a base steel sheet; a silicon-containing oxide layer provided on the base steel sheet; an iron-based oxide layer provided on the silicon-containing oxide layer; and a tension-insulation coating provided on the iron-based oxide layer, having a thickness of 1 to 3 μm, and containing phosphate and colloidal silica as main components; wherein the base steel sheet contains, as chemical components, in terms of mass%, 2.5 to 4.5% of Si, 0.05 to 1.00% of Mn, 0% or more and less than 0.05% of Al, 0% or more and less than 0.1% of C, 0% or more and less than 0.05% of N, 0% or more and less than 0.1% of S, 0% or more and less than 0.05% of Se and 0% or more and less than 0.01% of Bi, and the remainder: Fe and impurities, wherein in an elemental analysis performed from a surface of the tension-insulation coating in a sheet thickness direction by glow discharge optical emission spectrometry as described in the description: (a) in a profile of a Si light emission intensity, there are four or more inflection points; (b) in the sheet thickness direction, the inflection point of the Si light emission intensity present closest to the base steel sheet side is present within a range of 0.3 to 1.5 μm toward the side of the surface of the tension-insulation coating from a saturation point at which an Fe light emission intensity is a maximum, and (c) a peak of the Si light emission intensity present closest to the base steel sheet side has a light emission intensity that is 1.3 times or more and 2.0 times or less the Si light emission intensity in the base steel sheet; (a) in a profile of a Si light emission intensity, there are four or more inflection points; (b) in the sheet thickness direction, the inflection point of the Si light emission intensity present closest to the base steel sheet side is present within a range of 0.3 to 1.5 μm toward the side of the surface of the tension-insulation coating from a saturation point at which an Fe light emission intensity is a maximum, and (c) a peak of the Si light emission intensity present closest to the base steel sheet side has a light emission intensity that is 1.3 times or more and 2.0 times or less the Si light emission intensity in the base steel sheet;