An image forming apparatus includes: a main body having a side wall in which an opening is formed; a cover for opening and closing the opening; and a guide member for guiding a printed recording sheet, arranged in a position facing to the opening. The guide member is pivotally supported at its lower end portion on the main body. When the cover is being opened and the guide member is pivoted around its lower end portion as a pivot axis so that an upper end portion of the guide member is tilted toward the opened cover and into a lying-back position, a second sheet-output passage is formed which extends from the image forming unit toward the opened cover through the opening. The guide member is movable to a position away from the opened cover when it is in the lying-back position.