Method for producing deposition mask, deposition mask, and method for producing organic semiconductor device

A method for manufacturing a vapor deposition mask including a resin layer, and a magnetic metal body formed on the resin layer, the method comprising the steps of:

• (A) providing a magnetic metal body having at least one first opening;
• (B) providing a substrate;
• (C) forming a resin layer by applying a solution including a resin material or a varnish of a resin material on a surface of the substrate, and then performing a heat treatment thereon;
• (D) after the steps (A), (B) and (C), securing the resin layer formed on the substrate onto the magnetic metal body so as to cover the at least one first opening, the step (D) including
• (D1) forming a metal layer by plating on a portion of the resin layer, and
• (D2) attaching the resin layer to the magnetic metal body with the metal layer therebetween;
• (E) forming a plurality of second openings in the resin layer;
• and
• (F) after the steps (D) and (E), removing the substrate from the resin layer.