Molding Die, Optical Element, and Method of Preparing Molding Die

摘要

In the present invention, provided is a molding die with which shape of the molding die can be reliably transferred to a molded material, even though precision molding is conducted at a shape error of 1.0 μm or less. This molding die possesses a glass substrate, at least one resin die formed on the glass substrate, and an inorganic oxide film to cover the glass substrate and the at least one resin, wherein the at least one resin die made of a photo-curable resin has a light transmittance of 20% or more with respect to light having a wavelength of 365 nm and has a hardness of 30-90 in terms of shore D, and the molding die comprises the inorganic oxide film having been subjected to a mold-releasing treatment.