PURPOSE: To suppress the decrease in durability of a photosensitive body after polishing by incorporating a metal having a smaller ionization tendency than hydrogen or the compd. of said metal to the polishing agent.

CONSTITUTION: The amt. of copper to be incorporated into a polishing agent needs to be determined by taking the polishing effect in the stage of polishing and the influence of the characteristic of a photosensitive body by the copper adsorbed on the surface of a photosensitive drum 9 and diffused into the photosentitive layer in the stage of polishing into consideration. The copper is preferably incorporated at 0.001W50pts.wt. by the weight of the polishing agent consisting of cerium oxide, etc. into said agent and is more preferably incorporated therein at 0.005W50pts.wt. Silver, gold, platinum or at least two kinds among these metals may be used besides copper as the metal to be incorporated into the polishing agent; further the inorg. compd. contg. said metals may be used as well. Liquid isopropyl alcohol is used as a dispersant for the copper and a pasty (for example, silicone oil, etc.) dispersant may be used as well. The polishing agent is coated on the surface of the drum 9 or is coated on a buff 36 or polishing by buffing is equally well. The polishing by buffing has the effect of making uneven polishing difficult to arise.