To allow the grinding of a ball groove or the like according to the abrasion quantity of a grinding wheel, prevent the occurrence of a size error by the abrasion of the grinding wheel (particularly initial abrasion), and facilitate the abrasion quantity control of the grinding wheel.

This groove grinding device grinding the ball groove G of a work W having a partially unground portion is provided with a control device 5 constituted of a CNC device 50 having a memory 52 storing the depth of cut quantity of the grinding wheel 4 in steps according to the number of grinding from immediately after truing based on the predetermined relation between the number of grinding of the ball groove G and the abrasion quantity of the grinding wheel 4. The depth of cut quantity of the grinding wheel 4 is controlled based on the depth of cut quantity of the grinding wheel stored in the memory 52.