Grain-oriented electrical steel sheet and method for manufacturing same

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, when elemental analysis is performed from a surface of the tension-insulation coating in a sheet thickness direction by glow discharge optical emission spectrometry,
• (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.