Patent ID: 8826697

Claim:
A method of manufacturing a glass plate, the method comprising: preparing a base glass plate having tapered portions each extending in a longitudinal direction of the base glass plate and each having in which a thickness between main faces of the base glass plate that increases from a facet of the base glass plate toward a center portion of the base glass plate in a width direction of the base glass plate; and softening the base glass plate by heating the base glass plate in a heating furnace to stretch the base glass plate into a glass plate having a desired thickness and a flatness greater than a flatness of the base glass plate, wherein the preparing of a base glass plate comprises: preparing a raw base glass plate that has main faces parallel to each other; and immersing a portion of the raw base glass plate where the tapered portion is to be formed in an etching liquid from a facet of the raw base glass plate in the width direction and etching the raw base glass plate while lowering a liquid surface of the etching liquid.