In an image forming apparatus, an upper unit rotates about a first shaft provided in an image forming device for forming an image on a sheet with respect to the image forming device. A slide portion is provided on the upper unit to slide in a forward direction toward a side of the image forming device in which the first shaft is provided and a backward direction opposite to the forward direction. The forward direction and the backward direction are perpendicular to an axial direction of the first shaft. A force applier applies a force to the upper unit in an open direction in which the upper unit is opened with respect to the image forming device. A force adjuster decreases the force applied by the force applier to the upper unit as the slide portion slides with respect to the upper unit in the forward direction.