Deposition mask package and deposition mask packaging method

A deposition mask packaging method for packaging a deposition mask having an effective region in which a plurality of through-holes is formed, the deposition mask packaging method comprising:

• preparing a receiving portion that has a first opposing surface and a concave portion provided on the first opposing surface and covered with a first flexible film;
• obtaining the deposition mask placed on the receiving portion;
• arranging a lid portion on the deposition mask such that the receiving portion and the lid portion face each other;
• and
• sandwiching the deposition mask between the receiving portion and the lid portion,
• wherein the effective region of the deposition mask is placed on the concave portion with the first flexible film interposed therebetween in the obtaining of the deposition mask,
• wherein ends on both sides in a first direction of the deposition mask are arranged on the first opposing surface of the receiving portion in the obtaining of the deposition mask,
• wherein an interposed sheet is interposed between the deposition mask and the first flexible film in the step of obtaining the deposition mask, and
• wherein a dimension of the interposed sheet in a second direction, orthogonal to the first direction in a plane direction of the deposition mask, is smaller than a dimension of the concave portion in the second direction.