Patent ID: 8016645

Claim:
A chamfering apparatus that chamfers an edge of an outer periphery of a glass substrate having a circular disk shape, the chamfering apparatus comprising: a grindstone having a cylindrical hollow end portion; a grindstone driving unit that rotates the grindstone around a longitudinal axis of the cylindrical hollow end portion; a substrate rotation-driving unit that rotates the glass substrate around a longitudinal axis of the glass substrate; and a pressing unit that presses the grindstone to the glass substrate such that an annular end surface of the grindstone contacts the edge of the outer periphery of the glass substrate while the cylindrical hollow end portion of the grindstone faces the outer periphery of the glass substrate, wherein the annular end surface of the grindstone is concavely curved and tilted such that an axial length of the grindstone increases from an innermost radius of the grindstone to an outermost radius of the grindstone.