An image forming apparatus includes an image bearing member; toner image forming means for forming a toner image on the image bearing member; a transfer member for transferring the toner image from the image bearing member onto a recording material; an executing portion for executing a first cleaning mode in which the transfer member is cleaned by being supplied with a voltage of an identical polarity to a normal charge polarity of toner during non-image formation and executing a second cleaning mode in which the transfer member is cleaned by being supplied with a voltage of an opposite polarity to the normal charge polarity of the toner during the non-image formation; and a control portion for changing a ratio between a first cleaning mode execution period and a second cleaning mode execution period depending on an operation environment of the image forming apparatus.