Metal plate for deposition mask, and deposition mask and manufacturing method therefor

A deposition mask, comprising:

• a metal plate that includes iron (Fe) and nickel (Ni),
• wherein the metal plate extends in a longitudinal direction of the metal plate from a first end to a second end,
• wherein the metal plate includes a first surface and a second surface opposite to the first surface,
• wherein the metal plate includes a deposition pattern region and a non-deposition region,
• wherein the deposition pattern region includes a plurality of effective regions and a plurality of ineffective regions,
• wherein part of the ineffective regions is disposed between different ones of the effective regions,
• wherein each of the effective regions includes a plurality of through-holes,
• wherein the metal plate includes a first groove, a second groove, a third groove, and a fourth groove,
• wherein the first groove, the second groove, the third groove, and the fourth groove are separate regions in which a corresponding groove is formed in a depth direction of the metal plate,
• wherein the first groove is disposed between the first end of the metal plate and a first side of the deposition pattern region, and the second groove is disposed between the second end of the metal plate and a second side of the deposition pattern region opposite to the first side,
• wherein the third groove is disposed between the first groove and an effective area closest to the first groove,
• wherein the fourth groove is disposed between the second groove and an effective area closest to the second groove.