Grain oriented electrical steel sheet and production method therefor

A grain oriented electrical steel sheet having a plurality of beam-irradiated regions formed by performing laser irradiation or electron beam irradiation onto a steel sheet surface in a widthwise direction of the steel sheet to introduce continued strain in a linear shape or in a dot sequence shape at an angle of not more than 30° with respect to the widthwise direction thereinto, wherein a juncture between the beam-irradiated regions satisfies equations (1) and (2):

• 0≤α≤0.3×a (1)
• −1.2×a+0.02×w−0.5×α−6.5≤β≤−0.13×a−200×(1/w)+5.4 (2)
• wherein α:
• RD spacing (mm) at a juncture between beam-irradiated regions,
• β:
• TD spacing (mm) at a juncture between beam-irradiated regions,
• a:
• beam spacing (mm), and
• w:
• average width of magnetic domain discontinuous part (μm),
• wherein the magnetic domain discontinuous part is a portion where magnetic domain structures are locally disturbed by introduction of thermal strain through beam irradiation such that the magnetic domain structures parallel to a rolling direction are interrupted or become discontinuous, and
• wherein α and β both cannot be 0 at the same time.