Grain-oriented electrical steel sheet and production method therefor

A grain-oriented electrical steel sheet comprising:

• closure domains, each closure domain containing a discontinuous region at a part thereof and each closure domain extending at an angle within 30° with respect to a transverse direction of the steel sheet;
• an irradiation surface having been irradiated with a high energy beam;
• and a non-irradiation surface opposed to the irradiation surface and having not been irradiated with the high energy beam, wherein a closure domain overlapping portion in the discontinuous region on the irradiation surface of the steel sheet has a length α in millimeters (mm) in the transverse direction that is longer than a length β in mm in the transverse direction of a corresponding closure domain overlapping portion on the non-irradiation surface of the steel sheet, and the length α in mm satisfies the following Expression (1) and the length β in mm satisfies the following Expression (2):
• 0.5 (mm)≤α (mm)≤5.0 (mm) (1)
• 0.2α (mm)≤β (mm)≤0.8α (mm) (2).