Grain-oriented electrical steel sheet

A grain-oriented electrical steel sheet, comprising:

• a chemical composition containing, by mass %,
• Si:
• 1.5% to 8.0%,
• Mn:
• 0.02% to 1.0%, and
• at least one selected from the group consisting of
• Sn:
• 0.010% to 0.400%,
• Sb:
• 0.010% to 0.400%,
• Mo:
• 0.010% to 0.200%, and
• P:
• 0.010% to 0.200%,
• with the balance being Fe and inevitable impurities;
• and
• crystal grains including coarse secondary recrystallized grains having an average grain size of 5 mm or more and fine grains having a grain size of 0.1 mm to 2.0 mm,
• wherein at least some of the coarse secondary recrystallized grains penetrate the steel sheet in a thickness direction and are respectively exposed on front and back surfaces of the steel sheet such that projection planes of the exposed surfaces of these coarse secondary recrystallized grains on the front and back surfaces form an overlapping region by overlapping at least partially with each other,
• wherein an area ratio of an area of the overlapping region to an average area of the exposed surfaces is 80% or more, and
• wherein the fine grains are present at a number density per unit area of 0.6 pieces/cm2 to 40 pieces/cm2.