So as to realize an image forming apparatus capable of withstanding a long period of practical use and which does not waste toners, an image forming apparatus is provided having a cleaning roller and a reverse charge promoting member which applies a bias having a reverse polarity to residual toners which have remained on a photoconductor, a charger unit for establishing the charge polarity of the toners to the same polarity as the surface of the photoconductor, and a developer roller to which is applied a bias voltage to enable the rollers to recover the toners on the photoconductor. In the image forming apparatus, there is a cleaner unit having a simplified construction in which there is a minimum of the waste of toners, and further, since in the image forming process the toners are efficiently discharged from the cleaner unit, the lowering of the cleaning performance hardly occurs.