PURPOSE: To prevent blurring of an image by using an AC corona destatizing device as a destatizing means of a photosensitive body at the time of forming plural color of toner images on the photosensitive body by repeating electric charging, exposing, developing and destatizing cycles repeatedly.

CONSTITUTION: The AC corona destatizing device 26 is used as he destatizing means of the photosensitive body 22 in the case of forming the toner images of Y, M and C on the body 22 by repeating the charging, exposing, developing and destatizing cycles repeatedly. Namely, the AC corona destatizing device 26 is used for destaticization of the photosensitive body and, therefore, the attenuation rates of the potential of the bare photosensitive body and the photosensitive body to which the toners adhere are uniformized. Generation of the electric field which induces scattering of the toners to the peripheral part of the image is thus obviated and, therefore the blurring of the image is prevented.