PRESS MOLDING GLASS MATERIAL, MANUFACTURING METHOD THEREOF, AND MANUFACTURING METHOD OF OPTICAL ELEMENT

PROBLEM TO BE SOLVED: To provide a press molding glass material which enables to obtain a glass molded body of a desired shape while suppressing fusion to a molding die regardless of glass deformation volume in press molding.SOLUTION: The press molding glass material includes: a core portion composed of optical glass; and a surface layer covering the core portion. The surface layer includes an outermost layer contacting with a molding surface of a molding die in press molding and an intermediate layer adjacent to the outmost layer, the outermost layer is a silicon oxide film having a surface free energy measured by a three-solution method of ≤75 mJ/mand having a film thickness of 0.10 , wherein in a case in which the bond-radius difference is >0.10 to 0.40 , a film thickness of the intermediate layer is ≤5 nm.