To provide a grindstone that can more evenly process a work-piece.SOLUTION: A grindstone 10 comprises an end face processing part 30 which has a plurality of tube parts 32 arranged along a processing end face 31 for polishing or grinding a work-piece and extending along a Z-direction orthogonal to the processing end face 31. The plurality of tube parts 32 of the end face processing part 30 comprise a first tube part 32a having a plurality of confronting wall parts 33a arranged to separate from each other by a first distance Da in a circumferential direction C of the grindstone 10, and a second tube part 32b positioned closer to an inside R1 in a radial direction of the grindstone 10 than the first tube part 32a, having a plurality of confronting wall parts 33a arranged to separate from each other by a second distance Db smaller than the first distance Da in the circumferential direction C.SELECTED DRAWING: Figure 3
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