To provide centrifugal barrel polishing device which effectively bevels a piezoelectric element plate that is decreased in size and increased in frequency, in a short period of time, and inexpensively provides an electric component such as a piezoelectric oscillator using the piezoelectric element plate in a short period of time.

The centrifugal barrel polishing device 11 comprises: a revolution plate 13 fixed to a revolution shaft 14 provided in a vertical direction to an installing surface; a rotation shaft 16 provided on the revolution plate 13, and being vertical to the device installing surface or having a certain tilting angle in the revolution shaft side; a container holder 15 fixed to the rotation shaft 16 to rotate; a machining container 17 fixed and held by the container holder 15, and arranged with polishing machining particles in an inner wall thereof; and a driving motor and a driving rotation mechanism rotating the revolution shaft 14 and the rotation shaft 16 individually or together, and controlling a rotation direction, rotation speed, and rotation time.