An image forming apparatus including an image bearing member, an image forming portion, a transfer portion, a moving portion, a re-conveyance portion, a detection portion, a detection portion, and a control portion is provided. The moving portion includes a sheet in a width direction, and the re-conveyance portion inverts the sheet bearing a toner image transferred onto a first surface thereof and conveys the sheet to the transfer portion again. The control portion controls the image forming portion to form the toner image for the first surface on a first image position and a toner image for a second surface on a second image position and controls the moving portion to move the sheet to a position corresponding to the first image position or the second image position.