| 摘要 |
A developing device includes a developing container, provided with an opening, for containing a developer; a developing roller, provided at the opening, for forming a developer image on an image bearing member; a seal member, provided at the opening along an end portion of the developing roller, for preventing toner leakage from a gap between the opening and the developing roller; and a developer supplying roller, including a core material and a cylindrical elastic member which is provided around the core material and is contacted to the developing roller, for supplying the developer to the developing roller. The cylindrical elastic member has an end surface and a central portion with respect to a longitudinal direction thereof. The end surface has an outer diameter larger than that of the central portion so as to be in non-contact with the seal member.
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