BOTH-SIDE COPYING MACHINE

PURPOSE:To uniformly use two photosensitive bodies and to reduce the frequencies of maintenance by executing a changeover to an image formation by means of an image forming part including the photosensitive body having a small number of transfers, to make a copy, when a one side is copied. CONSTITUTION:When one-side original is copied, an image formation control part 42 executes the changeover to the image formation by the photosensitive body of the side having a small number of copies. A display part 43 has a display whether the surface to be copied, of the one-side original is set so as to face an original placing plate or not, accompanying with the changeover, and simultaneously, a carrying control part 44 operates by-pass changeover means 83 and 84 so as to bypass the photosensitive body of the side having a large number of the transfers and carry a transfer form. Therefore, when the frequency of the copying of the one-side original is high, as well, two photosensitive bodies are can be uniformly used, and consumed, so that they can be simultaneously, exchanged.