An image forming apparatus includes: a shell; a heating part; a pressurization roller configured to form a fixing clamping portion with the heating part, wherein a sheet, on which a toner image is formed, is transferred to the fixing clamping portion, and the toner image is formed on the sheet; a curl correcting unit comprising a first roller and a second roller and used for correcting curl of the sheet, wherein the first roller and the second roller form a correcting clamping portion together, and the correcting clamping portion is arranged on a downstream of the fixing clamping portion; a holding portion which rotatably holds the second roller; a biasing member which applies a force to the holding portion along a direction enabling the second roller and the first roller to be contacted; a door which rotatably holds the first roller and comprising a guide portion, wherein the guide portion guides the sheet towards the correcting clamping portion, the door is configured to be opened and closed relative to the shell, and the first roller is separated from the second roller by opening; and a retracting portion which allows the holding portion to be retracted to a position where the second roller deviates from a movement path of the guide portion according to a closing operation of the door.