There is provided a method for manufacturing a substrate for a display panel including a rib and a flat surface (hereinafter referred to as “substrate surface”) formed on one surface, the substrate surface being the region other than the rib in the substrate and including an electrode provided thereon, the substrate having a convex/concave shape (hereinafter referred to as “a substrate convex/concave shape”) composed of the rib and the substrate surface, comprising: a step 1 for positioning a mold having a convex/concave shape (hereinafter referred to as “a mold convex/concave shape) that is reversed to the substrate convex/concave shape so that the mold convex/concave shape and the substrate convex/concave shape are fitted to each other, the mold being provided with a flat surface (hereinafter referred to as “a mold convex surface”) facing to the substrate surface at a convex portion of the mold convex/concave shape, and with a surface (hereinafter referred to as “a mold concave bottom surface”) facing to a top surface of the rib (hereinafter referred to as “a rib top surface”) at a concave portion of the mold convex/concave shape; a step 2 performed after the step 1, for injecting an electrode material from an injection inlet opened on the mold convex surface; and a step 3 performed after the step 2, for solidifying the electrode material and detaching the mold from the substrate.