Grain-oriented electrical steel sheet and method for manufacturing same

A grain-oriented electrical steel sheet comprising a base steel sheet and an insulation coating arranged in contact with the base steel sheet, characterized in that

• the base steel sheet includes, as a chemical composition, by mass %,
• 3.0 to 4.0% of Si,
• 0.010 to 0.50% of Mn, and
• a balance including Fe and impurities, and
• the base steel sheet includes an internally oxidized SiO2 within a range of 2.0 m from an interface with the insulation coating toward a thickness direction when viewing a cross section whose cutting direction is parallel to the thickness direction and perpendicular to a transverse direction.