A metallic material OLED deposition mask, the deposition mask comprising: a deposition region and a non-deposition region, wherein the deposition region includes an effective portion and an ineffective portion, wherein the effective portion (AA1, AA2, and AA3) includes a plurality of through holes including a small surface hole formed on one surface and a large surface hole communicated with the small surface hole on the other surface opposite to the one surface, and an island portion between the plurality of large surface holes or the plurality of small surface holes, wherein each of an average centerline average surface roughness in a longitudinal direction and an average centerline average surface roughness in a lateral direction of the island portion is 0.1 um to 0.3 um, each of an average 10-point average surface roughness in the longitudinal direction and an average 10-point average surface roughness in the lateral direction of the island portion is 0.5 um to 2.0 um, a deviation of a value of the average centerline average surface roughness (Ra) in the longitudinal direction of the island portion with respect to the average centerline average surface roughness (Ra) in the lateral direction of the island portion is less than 50%, and a deviation of a value of the average 10-point average surface roughness (Rz) in the longitudinal direction of the island portion with respect to the average 10-point average surface roughness (Rz) in the lateral direction of the island portion is less than 50%, wherein the longitudinal direction is a rolling direction of the metallic material, and the lateral direction is a direction perpendicular to the rolling direction, characterized in that each of an average centerline average surface roughness in a longitudinal direction and an average centerline average surface roughness in a lateral direction of the non-deposition region are 0.1 um to 0.3 um, each of an average 10-point average surface roughness Rz in the longitudinal direction and an average 10-point average surface roughness in the lateral direction of the non-deposition region are 0.5 um to 2.0 um, a deviation of a value of the average centerline average surface roughness in the longitudinal direction of the non-deposition region with respect to the average centerline average surface roughness in the lateral direction of the non-deposition region is less than 50%, and a deviation of a value of the average 10-point average surface roughness in the longitudinal direction of the non-deposition region with respect to the average 10-point average surface roughness in the lateral direction of the non-deposition region is less than 50%. a deposition region and a non-deposition region, wherein the deposition region includes an effective portion and an ineffective portion, wherein the effective portion (AA1, AA2, and AA3) includes a plurality of through holes including a small surface hole formed on one surface and a large surface hole communicated with the small surface hole on the other surface opposite to the one surface, and an island portion between the plurality of large surface holes or the plurality of small surface holes, wherein each of an average centerline average surface roughness in a longitudinal direction and an average centerline average surface roughness in a lateral direction of the island portion is 0.1 um to 0.3 um, each of an average 10-point average surface roughness in the longitudinal direction and an average 10-point average surface roughness in the lateral direction of the island portion is 0.5 um to 2.0 um, a deviation of a value of the average centerline average surface roughness (Ra) in the longitudinal direction of the island portion with respect to the average centerline average surface roughness (Ra) in the lateral direction of the island portion is less than 50%, and a deviation of a value of the average 10-point average surface roughness (Rz) in the longitudinal direction of the island portion with respect to the average 10-point average surface roughness (Rz) in the lateral direction of the island portion is less than 50%, wherein the longitudinal direction is a rolling direction of the metallic material, and the lateral direction is a direction perpendicular to the rolling direction, characterized in that each of an average centerline average surface roughness in a longitudinal direction and an average centerline average surface roughness in a lateral direction of the non-deposition region are 0.1 um to 0.3 um, each of an average 10-point average surface roughness Rz in the longitudinal direction and an average 10-point average surface roughness in the lateral direction of the non-deposition region are 0.5 um to 2.0 um, a deviation of a value of the average centerline average surface roughness in the longitudinal direction of the non-deposition region with respect to the average centerline average surface roughness in the lateral direction of the non-deposition region is less than 50%, and a deviation of a value of the average 10-point average surface roughness in the longitudinal direction of the non-deposition region with respect to the average 10-point average surface roughness in the lateral direction of the non-deposition region is less than 50%.