Image forming apparatus and copier

An image forming apparatus comprising:

• a photoreceptor comprising:
• an electroconductive substrate,
• a photosensitive layer comprising a charge generation material and a charge transport material, and overlying the electroconductive substrate, and
• a protection layer comprising an inorganic filler in an amount of from 3 to 25% by weight based on total weight of the protection layer and a binder resin, and overlying the photosensitive layer;
• a charger configured to charge the photoreceptor;
• an irradiator configured to form an electrostatic latent image on the photoreceptor;
• an image developer configured to develop the electrostatic latent image with a developer comprising a toner to form a toner image on the photoreceptor;
• a transferer configured to transfer the toner image onto a transfer material;
• and
• a cleaner configured to clean the photoreceptor, comprising a rotatable core and a looped brush fiber provided on the surface of the rotatable core so as to contact the photoreceptor.