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PURPOSE : A developing unit, a developing device and an image forming apparatus are provided to prevent a magnetic developer from being adhered to a stripping member.CONSTITUTION : A developing device body(66) is formed so that a developer container can be moved to a position opposite to a developing roll(68) centering on the axis of rotation(82). A thickness regulating member(70) controls thickness of the developer attached to a surface of a developing roll. A shielding member(72) blocks supply of the developer to the developing roll from the developer container. A stripping member(76) has a rare-earth magnet rotating in the clockwise direction under the control of a controller and strips the developer by the magnetic force, and then guides it to the developer container.© KIPO 2009