Electrophotographic image forming device

A tandem type electrophotographic image forming device using an organic photoreceptor obtained by sequentially laminating at least a charge generating layer and a charge transporting layer on a conductive support, the electrophotographic image forming device comprising

• a plurality of image forming units each including at least:
• an electrostatic latent image former that forms an electrostatic latent image on the organic photoreceptor;
• a developer that supplies a toner to the organic photoreceptor and develops the electrostatic latent image to form a toner image;
• a lubricant supplier that supplies a lubricant to a surface of the organic photoreceptor;
• and a cleaner including a cleaning blade that removes a toner remaining on the surface of the organic photoreceptor and a cleaning assist brush that is disposed on an upstream side in a rotational direction of the organic photoreceptor with respect to the cleaning blade and assists the cleaning blade, wherein
• at least one combination composed of two adjacent image forming units including toners having different colors satisfies the following formula (1) if a ratio of a circumferential speed of the cleaning assist brush with respect to a circumferential speed of an organic photoreceptor included in an image forming unit A disposed on an upstream side is represented by θ1 and a ratio of a circumferential speed of the cleaning assist brush with respect to a circumferential speed of an organic photoreceptor included in an image forming unit B disposed on a downstream side is represented by θ2.
• [Numerical formula 1]
• θ2>θ1 (1)