| 摘要 |
A developing unit of the present invention includes a case which accommodates toner containing pigment, a developing roller, a supply roller having chamfered ends and formed of an elastic member arranged to be pressed against a surface of the developing roller in such a manner as to supply toner to the surface of the developing roller. Also a first sealing member is disposed on the side ends faces of the developing roller and supply roller so as to prevent leakage to the outside portion of the case. Further, a second sealing member in the form of a film is pressed against a lower surface of the developing roller in order to prevent leakage of toner, wherein a quantity delta of displacement of the sealing member due to its abutment against the developing roller satisfies 0.1 mm<delta<0.8 mm, and the thickness t of the second sealing member satisfies 50 mum<t<500 mum.
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