PURPOSE: To improve the dimensional accuracy of ruggedness of a sleeve so as to improve image quality by forming a film by ion sputtering on the micro- rugged surface of the sleeve.

CONSTITUTION: The film 4 by the ion sputtering is formed on the micro-rugged 2 surface of the sleeve 3 of the electrophotographic developing roll having the sleeve 3 formed with a magnet roll 1 and the micro-ruggedness on the surface. The metallic film or ceramic film 4 can be formed uniformly at 0.2 to 1.2μm thickness in the case of formation of the film by the ion sputtering on the micro-ruggedness 2 of the sleeve 3. Since the film thickness is small in such a case, the effect of the micro-ruggedness formed by sand blasting, etc., can be maintained and, therefore, the image quality is improved. Since the film formed by the ion sputtering fluctuates less, the dimensional tolerance over the entire part of the sleeve does not increase in spite of the presence of fluctuations in metal working at the time of forming the sleeve. Then, the dimensional accuracy of the ruggedness of the sleeve is less affected and, therefore, the image quality is improved.