An image forming apparatus includes an image bearing member, supporting rollers, a belt-like-shaped medium, a primary transfer member, secondary transfer rollers, and a grounded conductive roller. The image bearing member forms a toner image at a predetermined process speed. The belt-shaped medium has a charge voltage. The primary transfer member sequentially transfers the toner image onto the belt-like-shaped medium and the secondary transfer member transfers the toner image onto a recording sheet. The conductive roller is arranged in contact with the belt-shaped medium for a predetermined wrapping length. A relationship Tb