PURPOSE: To provide an inexpensive image forming apparatus capable of being driven by low voltage and capable of forming an image of high quality.

CONSTITUTION: The surface roughness Rz of a toner support roller 14 is set to 2μm and the surface roughness Rz of the upstream surface 3 of an aperture electrode 1 is set to 0.2μm or less and the, surface roughness Rz of the downstream surface 5 thereof is set to about 6μm. Therefore, the coefficient of friction of toner with the upstream surface is smaller than that of the toner with the toner support roller and, as a result, toner supplied later pushes out toner supplied previously to an aperture. Since the coefficient of friction of the toner with the toner support roller is smaller than that of the toner with the downstream surface on a downstream side, the toner fed by the toner support roller is interrupted by the toner bonded to the downstream surface to be sent to the aperture. The toner sent to the aperture is drawn out to a support by a control electric field to fly toward the support to form a pixel.