Patent ID: 8865314

Claim:
A press molding glass material, comprising: a core portion composed of optical glass; and a surface layer covering the core portion, wherein the surface layer comprises an outermost layer which contacts a molding surface of a molding die in press molding, and an intermediate layer adjacent to the outermost layer, wherein the outermost layer is a silicon oxide film having a surface free energy measured by a three-solution method of equal to or less than 75 mJ/m 2 and having a film thickness of less than 15 nm, wherein in the silicon oxide, oxide is excessive with respect to a stoichiometric composition of silicon oxide, and wherein the intermediate layer is a film composed of a film material having a bond-radius difference from a silicon oxide based on a stoichiometric composition of more than 0.10 Å, wherein, in a case in which the bond-radius difference is more than 0.10 Å and equal to or less than 0.40 Å, a film thickness of the intermediate layer is equal to or less than 5 nm.