Abstract: There are disclosed a method of manufacturing a thin-plate glass having a good flatness with a high mass productivity and a method of manufacturing a high-quality and high-performance glass substrate for an information recording medium and a magnetic recording medium with a high mass productivity. A glass gob is press-formed between upper and lower dies to form a thin-plate glass. The press forming is finished when the inside of the thin-plate glass is at a softening point Ts or a higher temperature. Subsequently, warp modification pressing is performed to modify a warp of the thin-plate glass. The warp modification pressing is finished when the inside of the thin-plate glass is at a transition point Tg or a higher temperature.

Abstract: To provide a fabricating method and a fabricating apparatus of a planar glass molded article and a glass substrate capable of fabricating a thinner planer glass molded article in a state having small warp without extending cycle time and an information recording medium, a method of providing a planar glass molded article by pressing a glass material to be molded by using molds at least including an upper mold and a lower mold, includes a step of supplying the glass material to be molded having temperature higher than a glass transition point to a molding surface of the lower mold, a step of molding planar glass by press-molding the supplied glass material to be molded by the lower mold and the upper mold, a step of removing the upper mold from the planar glass and taking out the planar glass on the molding surface of the lower mold from the molding surface of the lower mold, a step of cooling the planar glass to temperature lower than a strain point of the glass, and a step of annealing the provided planar gl