A method of producing an optical device, which includes a center region where a light absorbing part is substantially absent, a peripheral region, and an intermediate region between the center and peripheral regions, where the thickness of the light absorbing part gradually increases in a direction from the center region to the peripheral region, includes applying a resin material that absorbs light onto a transparent base material. A forming mold including a convex and a concave corresponding to the shape of the light absorbing part is pressed against the applied resin material. The light absorbing part is formed by curing the resin material through exposure to ultraviolet radiation with the forming mold being pressed against the resin material. A surface of the convex that faces the resin material when the forming mold is pressed against the resin material corresponds to the center region of the optical device and is flat.