Molten-glass-cutting shear blades

Provided are shear blades that are less likely to produce shear marks or top lines/top bubbles and can allow for longer intervals between shear blade replacements when gob-cutting. The molten-glass-cutting shear blades (1, 2) have hard layers (10, 20), which are harder than the base material and are provided only at the surfaces where the pair of blade edges will come into mutual contact. The blade back portions which come into contact with the glass and have no hard layer become worn in gob-cutting while the hard surfaces of the blade edges are preserved; thus, the shear blades are sharpened from the black back portions and the sharpness of the blade edges is preserved .