Chamfering apparatus for a glass substrate

Chamfering apparatus for a glass substrate, a table for holding a glass substrate, an annular groove for chamfering the end surface of the glass substrate held on the table is a plurality of formed at predetermined intervals in the axial direction circle a columnar grindstone, a rotation drive unit for rotating the grinding wheel, a first moving unit for moving the grinding wheel in a direction perpendicular to the plane of the glass substrate held on the table, the grinding stone on the table a second moving unit that moves in the surface direction of the glass substrate held, a groove shape detection means for detecting a groove shape including the location information of the orthogonal direction and the surface direction of the plurality of annular grooves of the grindstone, the grinding wheel reference groove shape of the perpendicular direction and also the design value of the grinding wheel including the position information of the plane direction at the position that is attached to the reference position of the rotary drive unit are stored, the from the reference groove shape groove shape A control unit for controlling the first moving portion and / or said second mobile unit based on the groove shape, which is detected by the detecting means.