The present invention provides a highly-reliable image-forming apparatus. The image-forming apparatus includes an image carrier and a plurality of holders. A latent image is formed on the image carrier. The plurality of holders detachably hold a plurality of developing devices. The developing devices develop the latent image formed on the image carrier with toner of differing colors. The image carrier includes inspecting device capable of performing an inspection of whether or not the developing device is attached to the holder, and a nonvolatile rewritable storage region which stores detachment data for the developing device.