| 摘要 |
A developing device, includes: a housing (41) that stores toner inside; a toner carrier roller (44) that is shaped approximately like a cylinder, is mounted to the housing rotatably about a rotational axis, rotates while carrying the toner on a surface thereof to convey the toner to outside of the housing, and is provided, on the surface thereof, with a plurality of convex sections (441) which are regularly arranged and a concave section (442) which surrounds the convex sections (441), the convex sections (441) including top surfaces that coincide with a part of a curved surface of single cylinder and have electrical conductivity; and a seal member (47) that is arranged in abutting contact with the surface of the toner carrier roller (44) moving from the outside the housing (41) toward the inside the housing (41) at a position downstream of the opposed position in a rotation direction of the toner carrier roller (44) to prevent toner leakage from the housing (41), a contact surface of the seal member (47) being made of a material located at a position to charge the toner with a polarity opposite to its charging polarity in triboelectric series.
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