A charging device for electrically charging an image bearing member, includes a contact charging member contactable to the image bearing member to charge the image bearing member, the contact charging member being supplied only with a DC voltage; and a contact member contacted to the charging member, wherein the image bearing member is adapted to carry a toner image of toner which contains an externally added material comprising silica, wherein work functions of the charging member, the contact member and the silica satisfy, (the work function of the contact member)>(the work function of the silica)>(the work function of the charging member).

 
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< Image forming apparatus capable of reducing time unable to perform image formation due to temperature change of image Bearing member

> Image forming apparatus with decreased potential difference between a belt member transfer portion and a belt member bending portion

> Image forming apparatus including a cleaning web for removing residual toner

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