A grain oriented electrical steel sheet reduces local exfoliation of insulating coating films and thus has excellent corrosion resistance and insulation properties. The grain oriented electrical steel sheet may be obtained by, assuming that a1 (μm) is a film thickness of the insulating coating at the floors of linear grooves and a2 (μm) is a film thickness of the insulating coating on a surface of the steel sheet at portions other than the linear grooves, controlling a1 and a2 to satisfy the following formulas (1) and (2): 0.3 μm≦a2≦3.5 μm  (1), and a1/a2≦2.5  (2).