A manufacturing method of a window glass includes providing a window glass including a folding portion and non-folding portions spaced apart from each other with the folding portion interposed therebetween, heating the window glass to make the folding portion in a bent state, and polishing one surface of the folding portion in the bent state.

A glass polishing apparatus includes a jig that holds a glass structure. The glass polishing apparatus includes a first flat portion, a second flat portion opposite to the first flat portion, and a curved portion connecting the first flat portion to the second flat portion. The jig and includes a first holding surface holding the first flat portion, a second holding surface disposed opposite to the first holding surface and holding the second flat portion, and a third holding surface connecting the first holding surface to the second holding surface and holding the curved portion. At least a portion of a roller unit having a cylindrical shape is inserted between the first flat portion and the second flat portion.

In a method for manufacturing a glass plate that includes chamfering processing for chamfering an edge surface of a glass plate, the chamfering processing includes a step of forming a chamfered surface by irradiating the edge surface of the glass plate with a laser beam, and a step of heating the glass plate before the chamfered surface is formed. When a temperature of the glass blank at which the glass blank is heated is Tp [ C.], a glass transition point of the glass blank is Tg [ C.], and an average coefficient of linear thermal expansion of the glass blank is [1/ C.], (TgTp)5.6710.sup.7.Math.+840 is satisfied.