An image forming apparatus includes a toner image carrying member, an image transfer device, a fixing device, a registration unit, a guide member, an upstream-side transportation unit, and a downstream-side transportation unit. The image transfer device transfers a toner image from the toner image carrying member to a recording medium. The fixing device fixes the toner image. The registration unit transports the recording medium. The guide member guides the recording medium. The upstream-side transportation unit includes an upstream-side transportation member, disposed at an upstream side in the transport direction of the recording medium. The downstream-side transportation unit includes the downstream-side transportation member, disposed at a downstream side in the transport direction of the recording medium. The upstream-side transportation unit includes an upstream-side positioning member to position the guide member to the upstream-side transportation member. The downstream-side transportation unit includes a downstream-side positioning member to position the guide member to the downstream-side transportation member.