PURPOSE: To simultaneously work a small quantity of ≥2 kinds of plating objects and to eliminate the need for screening after working by charging the plating objects into a rotary barrel and further housing another plating objects into an inside barrel and charging this barrel into the rotary barrel.

CONSTITUTION: The plating objects 4 are directly charged into the rotary barrel 6 and another kind of the plating objects 4a are housed into the inside barrel 17 and are charged into the rotary barrel 6. The inside barrel 17 is formed of a nonconductive stock and has an electrode 15 and a communicating part 16 through which a plating liquid can enter and emerge. The outside part 15a of the electrode 15 exposed on the outer side of the inside barrel 17 comes into direct contact with the inside electrode 12 of the rotary barrel 6 when the rotary barrel 6 is agitated in the plating liquid 2. The electrode otherwise comes into contact with stainless steel balls 14 held in contact with the inside electrode 12. Plating current energizes to another kind of the plating objects 4a in this way and a small quantity of another kind of the plating objects 4a are subjected to the plating simultaneously with the ordinary plating objects 4.