PURPOSE: To prevent the rubbing and gouge of the mutual bodies to be polished and to enable a precise processing, by forming plural small chambers with the partition of a polishing tank made by fixing the internal part storing the body to be polished in parallel or at an angle in the axial and/or radial direction.

CONSTITUTION: For instance barrel polishing is executed after storing the body to be polished in the small chamber 21 divided by the bulk head 12 of a polishing tank 3. After a lapse of the specific time, the body to be polished only proper for the time thereof is taken out of the divided small chamber 21. The processing of the material of different polishing time is performed in succession by giving a rotation polishing to those of other small chamber 21.