To provide a grinding tool capable of creating excellent finished surfaces of grinding and highly efficient grinding.

On the base saucer 20 of this grinding tool, an abrasive grain layer 21 whose volume abrasion grain content is less than about 5% (preferably about 1% or more and less than 5%) is formed. The abrasive grain layer 21 is a layer comprising hard ceramics abrasive grains and super abrasive grains bound by a plated phase comprising alloy including Ni and Co or at least one of them. On the surface of this abrasion grain layer 21, a plurality of grooves 21b to be grinding liquid supply passages and discharge passages are formed in a checker-pattern. However, the width and number of the grooves 21b must be determined in such a way that the total area of divided areas 21a becomes about 5% or more and 7% or less of the total area of the divided areas 21a and groove areas 21b.