AUXILIARY ELECTRODE FOR PLATING INNER SURFACE OF LONG OBJECT

PROBLEM TO BE SOLVED: To provide an auxiliary electrode for plating inner surface of long object, which can be easily inserted even into a bent tubular article, can satisfactorily perform the plating of an inner surface of the tubular article and is inexpensive.SOLUTION: The auxiliary electrode 10, which is inserted into an inner part of the tubular article and is used in order to subject the inner surface of the tubular article 20 to electric plating, includes: a linear auxiliary anode 11; auxiliary electrode spacers 50 attached to the auxiliary anode; and an auxiliary electrode spring member 40. The auxiliary electrode spacers 50 are formed with nonconductive materials and are formed in an abacus bead shape, in which a contour central part is extended in an outer diameter direction, a ball shape or an oval sphere shape, and a center pore 51 is formed on the center part thereof. The auxiliary electrode spring member 40 is formed with nonconductive materials and is formed in a coil shape. The auxiliary electrode spacers 50 and the auxiliary electrode spring member 40 are alternately inserted into the auxiliary anode 11.