| 摘要 |
A developing device comprises: a toner carrying member (15) for carrying toner T towards a photosensitive drum, using a traveling wave electric field; a belt member (16) which is provided so as to cover the surface of the toner carrying member (15), the surface facing the photosensitive drum (2); a belt drive roller (18) which is in touch with the belt member (16) so as to rotate the belt member (16) around the toner carrying member (15); and a drive assistance roller (19) for sandwiching the belt member (16) with the belt drive roller (18). With this arrangement, it is possible to provide a developing device which is silent, small in size, and capable of reducing costs, and an image forming device including the developing device.
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