Abstract: A barrel polishing device for polishing a workpiece having a relatively complicated shape such as a vehicle wheel. The barrel polishing device comprises a polishing medium storage tank for storing polishing media, a base, a workpiece supporting shaft mounted on the base, and a workpiece detachably mounted on a tip part of the workpiece supporting shaft, the polishing media stored in the polishing medium storage tank being flowed by an appropriate means, and the workpiece supporting shaft being disposed so that a front side of the workpiece opposes the flow of the polishing media, the workpiece supporting shaft being rotated about an axis thereof, and a baffle member being placed in the vicinity of a back side of the workpiece.