Deposition mask, deposition mask apparatus, manufacturing method of deposition mask, and manufacturing method of deposition mask apparatus

A deposition mask comprising:

• a first mask having openings formed therein;
• and
• a second mask superposed on the first mask and having a plurality of through-holes formed therein, each through-hole having a planar dimension smaller than a planar dimension of each opening;
• wherein:
• the second mask has a rectangular outer edge;
• the deposition mask has a plurality of joints that join the second mask and the first mask to each other;
• the plurality of joints are arranged along all sides of the outer edge of the second mask;
• and
• a notch is formed at a position corresponding to a space between two adjacent joints arranged along the same side of the outer edge of the second mask.