PURPOSE: To polish a polished work stably so sufficient enough irrespective of the form, material, specific gravity or the like by installing some projections on an inner circumferential surface of an abrasive barrel toward the turning center at regular intervals.

CONSTITUTION: Some projections 3 are installed on the inner circumferential surface of an abrasive barrel 1 toward the turning center at regular intervals. With this constitution, respective polished works themselves are in no case stuck to each other, thus they are fully polishable as none of them is left behind on the bottom of the abrasive barrel 1.