Image forming apparatus

An image forming apparatus comprising:

• an image forming device configured to form a toner image;
• an image bearer configured to bear the toner image formed by the image forming device;
• a transferrer configured to transfer the toner image from the image bearer to a recording medium;
• a cleaner configured to clean a surface of the image bearer;
• and
• an adhesion amount detector facing the surface of the image bearer to detect a toner adhesion amount of the toner image,
• the image forming device being configured to form, on the image bearer, a toner image pattern to be input to the cleaner without being transferred to the recording medium,
• the toner image pattern being a belt-shaped pattern elongated in an orthogonal direction orthogonal to a traveling direction of the image bearer,
• the toner image pattern having a greater amount of toner input to a portion of the cleaner corresponding to a position of the adhesion amount detector in the orthogonal direction than an amount of toner input to a portion of the cleaner not corresponding to the position of the adhesion amount detector in the orthogonal direction.