An image forming apparatus comprising: a circularly drivable intermediary transfer belt for bearing a toner image; toner image forming means (2a-6a, 2b-6b, 2c-6c, 2d-6d, 7) including a rotatable photosensitive member (2a, 2b, 2c, 2d), for forming a toner image on said intermediary transfer belt by electrophotographically forming a toner image on the rotatable photosensitive member; transferring means (10, 1 2) for transferring a toner image formed on said intermediary transfer belt onto a recording material; a cleaning member for contacting said intermediary transfer belt to remove toner, said cleaning member being disposed downstream of said transferring means and upstream of said toner image forming means with respect to a movement direction of said intermediary transfer belt; a detecting member (1028, 1029) for detecting a detection toner image formed on said intermediary transfer belt; and a controlling means (171, 200, 1050, 1051) for controlling apparatus operation, which is adapted to variably control a toner image forming condition of said toner image forming means in accordance with a detection result by said detecting member and to execute a recovery mode operation in response to an operator requesting (600, 700, 800) such execution; characterized in that, in the recovery mode operation, said intermediary transfer belt is circularly driven in a state where said cleaning member is in contact with said intermediary transfer belt until adherent residues on the intermediary transfer belt are deemed satisfactory removed; and in that, in the recovery mode operation before said residue removal has ended, on said intermediary transfer belt, first a toner band is formed which is not transferred onto a recording material and extends in a maximum image range measured in a direction perpendicular to a movement direction of said intermediary transfer belt, then, after said cleaning member has removed the toner band, a detection toner image is formed on said intermediary transfer belt and detected by the detecting member. a circularly drivable intermediary transfer belt for bearing a toner image; toner image forming means (2a-6a, 2b-6b, 2c-6c, 2d-6d, 7) including a rotatable photosensitive member (2a, 2b, 2c, 2d), for forming a toner image on said intermediary transfer belt by electrophotographically forming a toner image on the rotatable photosensitive member; transferring means (10, 1 2) for transferring a toner image formed on said intermediary transfer belt onto a recording material; a cleaning member for contacting said intermediary transfer belt to remove toner, said cleaning member being disposed downstream of said transferring means and upstream of said toner image forming means with respect to a movement direction of said intermediary transfer belt; a detecting member (1028, 1029) for detecting a detection toner image formed on said intermediary transfer belt; and a controlling means (171, 200, 1050, 1051) for controlling apparatus operation, which is adapted to variably control a toner image forming condition of said toner image forming means in accordance with a detection result by said detecting member and to execute a recovery mode operation in response to an operator requesting (600, 700, 800) such execution; characterized in that, in the recovery mode operation, said intermediary transfer belt is circularly driven in a state where said cleaning member is in contact with said intermediary transfer belt until adherent residues on the intermediary transfer belt are deemed satisfactory removed; and in that, in the recovery mode operation before said residue removal has ended, on said intermediary transfer belt, first a toner band is formed which is not transferred onto a recording material and extends in a maximum image range measured in a direction perpendicular to a movement direction of said intermediary transfer belt, then, after said cleaning member has removed the toner band, a detection toner image is formed on said intermediary transfer belt and detected by the detecting member.