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, 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, 0% or more and less than 0.01% of Bi, and the remainder: Fe and impurities as chemical components, and 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) there are two or more peaks of a Si emission intensity; (b) a peak A which is a peak of the Si emission intensity existing furthest to the base steel sheet side in the sheet thickness direction exists between an inflection point at which a rate of increase in an Fe emission intensity in the sheet thickness direction from the surface of the tension-insulation coating changes and a saturation point at which the Fe emission intensity become saturated; and (c) a length of a perpendicular line drawn from the top portion of a peak to a baseline connecting valley portions closest to the peak is defined as a peak height, and a peak height of the peak A is 0.30 times or more and 2.5 times or less the Si emission intensity in the base steel sheet; wherein the thickness of the iron-based oxide layer is within the range of 100 to 500 nm. 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, 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, 0% or more and less than 0.01% of Bi, and the remainder: Fe and impurities as chemical components, and 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) there are two or more peaks of a Si emission intensity; (b) a peak A which is a peak of the Si emission intensity existing furthest to the base steel sheet side in the sheet thickness direction exists between an inflection point at which a rate of increase in an Fe emission intensity in the sheet thickness direction from the surface of the tension-insulation coating changes and a saturation point at which the Fe emission intensity become saturated; and (c) a length of a perpendicular line drawn from the top portion of a peak to a baseline connecting valley portions closest to the peak is defined as a peak height, and a peak height of the peak A is 0.30 times or more and 2.5 times or less the Si emission intensity in the base steel sheet; wherein the thickness of the iron-based oxide layer is within the range of 100 to 500 nm. (a) there are two or more peaks of a Si emission intensity; (b) a peak A which is a peak of the Si emission intensity existing furthest to the base steel sheet side in the sheet thickness direction exists between an inflection point at which a rate of increase in an Fe emission intensity in the sheet thickness direction from the surface of the tension-insulation coating changes and a saturation point at which the Fe emission intensity become saturated; and (c) a length of a perpendicular line drawn from the top portion of a peak to a baseline connecting valley portions closest to the peak is defined as a peak height, and a peak height of the peak A is 0.30 times or more and 2.5 times or less the Si emission intensity in the base steel sheet; wherein the thickness of the iron-based oxide layer is within the range of 100 to 500 nm.