To provide a structure which allows static electricity to be promptly discharged through a grounding wire by using a conductive and flexible sheet cover member, causing the sheet cover member to open and close an opening through the effects of moving means, and grounding the moving means.

In a cleaning mechanism, a sheet cover member is disposed being bent from an upper surface of a housing so as to be arranged along a side wall of the housing through a roller and static electricity of the sheet cover member is grounded through the moving means. A processing device includes the cleaning mechanism.