Abstract: A method for manufacturing a glass optical element having at least one concave surface, including: softening a glass molding material by heating, molding the softened material with a first mold having a first molding surface and a second mold having a second molding surface by applying a pressure, the first molding surface including a first concave forming surface, the second molding surface including a convex forming surface, a planar forming surface or a second concave forming surface, the second concave forming surface having a curvature radius greater than that of the first concave forming surface, whereby the applying of the pressure starts when the first mold and the second mold are at temperatures above a glass transition temperature of said glass molding material, the glass material is cooled so that a temperature of the glass material reaches a temperature equal to or lower than a glass transition temperature (Tg) of the glass material, and the cooled glass material is removed from either of the firs

Abstract: Provided is a method for manufacturing a glass optical element having at least one concave surface, comprising the following steps: softening a glass molding material by heating, molding the softened material with a first mold having a first molding surface and a second mold having a second molding surface by applying a pressure, the first molding surface comprising a first concave surface, the second molding surface comprising a convex surface, planar surface or second concave surface, the second concave surface having a curvature radius greater than that of said first concave surface, whereby shapes of the first molding surface and the second molding surface are transferred to the material, cooling the material so that a temperature of the material reaches a temperature equal to or lower than glass transition temperature (Tg), and removing the cooled material from either of said first mold or said second mold.