A glass plate having a first main surface (12, 102, 212, 312, 412) and a second main surface (14, 104, 214, 314, 414) opposite each other, a plurality of separation lines (20, 220, 320, 420) being formed in the glass plate and on the first main surface (12, 102, 212, 312, 412) by irradiating the glass plate with laser light, the separation lines (20, 220, 320, 420) being configured of at least one product line (30, 230, 330, 430) and at least one release line (32, 240, 340, 340A, 340B, 440); the product line (30, 230, 330, 430) corresponding to an outline of a glass article (80, 280, 380, 480) to be separated and extracted from the glass plate; and the release line (32, 240, 340, 340A, 340B, 440) being a part of the separation lines (20, 220, 320, 420) other than the product line (30, 230, 330, 430), the product line (30, 230, 330, 430) including a first in-plane void array configured of a plurality of in-plane voids (139, 239, 249, 349) arranged on the first main surface (12, 102, 212, 312, 412); the product line (30, 230, 330, 430) further including a plurality of internal void arrays for product line, each having an in-plane void (139, 239, 249, 349) of the first in-plane void array, and extending from the first main surface (12, 102, 212, 312, 412) toward the second main surface (14, 104, 214, 314, 414); and the internal void array for product line being configured of a plurality of internal voids for product line, the release line (32, 240, 340, 340A, 340B, 440) including an internal void array for release line (260, 360, 360A-1, 360A-2, 360B) arranged along each of a plurality of lines connecting the first main surface (12, 102, 212, 312, 412) and the second main surface (14, 104, 214, 314, 414); and the internal void array for release line (260, 360, 360A-1, 360A-2, 360B) being configured of a plurality of internal voids for release line (268, 368), and (i) a length of the internal void array for product line having a maximum length among the internal void arrays for product line L 1max is equal to a length of the internal void array for release line (260, 360, 360A-1, 360A-2, 360B) having a maximum length among the internal void arrays for release line (260, 360, 360A-1, 360A-2, 360B) L 2max; and a length of the internal void array for product line having a minimum length among the internal void arrays for product line L 1min is greater than a length of the internal void array for release line (260, 360, 360A-1, 360A-2, 360B) having a minimum length among the internal void arrays for release line (260, 360, 360A-1, 360A-2, 360B) L 2min, or (ii) the length L 1max is greater than the length L 2max. a plurality of separation lines (20, 220, 320, 420) being formed in the glass plate and on the first main surface (12, 102, 212, 312, 412) by irradiating the glass plate with laser light, the separation lines (20, 220, 320, 420) being configured of at least one product line (30, 230, 330, 430) and at least one release line (32, 240, 340, 340A, 340B, 440); the product line (30, 230, 330, 430) corresponding to an outline of a glass article (80, 280, 380, 480) to be separated and extracted from the glass plate; and the release line (32, 240, 340, 340A, 340B, 440) being a part of the separation lines (20, 220, 320, 420) other than the product line (30, 230, 330, 430), the product line (30, 230, 330, 430) including a first in-plane void array configured of a plurality of in-plane voids (139, 239, 249, 349) arranged on the first main surface (12, 102, 212, 312, 412); the product line (30, 230, 330, 430) further including a plurality of internal void arrays for product line, each having an in-plane void (139, 239, 249, 349) of the first in-plane void array, and extending from the first main surface (12, 102, 212, 312, 412) toward the second main surface (14, 104, 214, 314, 414); and the internal void array for product line being configured of a plurality of internal voids for product line, the release line (32, 240, 340, 340A, 340B, 440) including an internal void array for release line (260, 360, 360A-1, 360A-2, 360B) arranged along each of a plurality of lines connecting the first main surface (12, 102, 212, 312, 412) and the second main surface (14, 104, 214, 314, 414); and the internal void array for release line (260, 360, 360A-1, 360A-2, 360B) being configured of a plurality of internal voids for release line (268, 368), and (i) a length of the internal void array for product line having a maximum length among the internal void arrays for product line L 1max is equal to a length of the internal void array for release line (260, 360, 360A-1, 360A-2, 360B) having a maximum length among the internal void arrays for release line (260, 360, 360A-1, 360A-2, 360B) L 2max; and a length of the internal void array for product line having a minimum length among the internal void arrays for product line L 1min is greater than a length of the internal void array for release line (260, 360, 360A-1, 360A-2, 360B) having a minimum length among the internal void arrays for release line (260, 360, 360A-1, 360A-2, 360B) L 2min, or (ii) the length L 1max is greater than the length L 2max.