An image forming apparatus including a main body, a first guide member coupled to the main body so as to be rotated from a first position to a second position, and a second guide member rotatably coupled to the first guide member. The first guide position defines a first paper discharge path to discharge paper, a printed surface of which is inverted, when it is in the first position. The first guide member defines a second paper discharge path, along which the printed surface of the paper is directly discharged, when it is pivotally rotated from the first position to the second position. The second guide member guides the paper on the first paper discharge path and does not interfere with the paper on the second paper discharge path.