PURPOSE: To offer a manufacturing method of a magent roll tecnically and fully enabling smoothing processing of the magent roll surface where a resin magnet is arranged on the surface of an axis core of a resin magnet in relation to a manufacturing method of the magnet roll as a developing roll to be used for an electronic photography system developing device such as a copying machine, a facsimile and a laser printer, especially in relation to a manufacturing method of the magnet roll having a smooth surface for developing suitable for a direct contact system electronic photograph developing method where a developing agent is brought into direct contact with the surface of this magnet roll without especially using a metal sleeve.

CONSTITUTION: The surface of a magnet roll where a ferrite group resin magnet is arranged on the axis core surface is smoothed by lathe turning processing.