A high-voltage circuit board and a main circuit board are arranged on the outer side surface of a left frame, and a conveyance path is provided so as to downwardly incline from a feed position near the uppermost part of the outer peripheral surface of a paper feed roller, toward an image formation position. Thus, the height position of an image forming section within a body casing can be lowered. As a result, the height of a laser printer can be made lower.