The developing roller, the developing device and image forming device

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PROBLEM TO BE SOLVED : To provide an inexpensive developing roller having high magnetic characteristics and high precision in the main polar part. SOLUTION : The peak width of a developing polar part of a ferrite magnet roller 51 is made smaller than that of a rare earth element magnet block 54. As a result, the half-value width of the magnetic waveform (a solid line shown in the figure) of the developing polar part as a magnet roller body 50 can be made to be 20 deg. or smaller and the magnetic flux density can be attained to 80 mT.