To provide a barrel polishing device capable of preventing working of itself in a state where connection of a clutch part is weak, restraining working dispersion of a plurality of barrels to the utmost and eliminating failure of the device.

This barrel polishing device is constituted of a driving part 3, a drum 1 to be rotated and driven by rotating main spindle 110 at a driving transmission part from the driving part, a drum pulley 111 fixed on the rotating main spindle through a clutch part 112 and the barrels 21, 22 set in the neighborhood of an outer periphery of the drum in a state free to rotate and rotated and driven by the drum pulley and the driving transmission part, and a sensor part S to sense that the drum pulley is rotated against a bearing F2 and an information part to alarm and inform when the sensor part senses that the drum pulley is rotated against the bearing are provided.