To provide a dresser that can reliably provide truing with respect to a grinding part of a drill without causing the drill to be damaged such as bending even when the drill for drilling a glass plate has a small diameter.

The dresser 1 for a drill has a truing part 2 for providing truing with respect to the drill 6 that drills a glass plate by a grinding part 7 in which abrasive grains are dispersed and retained in a binding material. The truing part 2 is formed such that the abrasive grains are dispersed and retained in the binding material with a binding force smaller than that of the abrasive grains of the grinding part 7 of the drill 6.