A color electrophotographic image forming apparatus in which a cartridge tray supporting a plurality of cartridges is movable through a plurality of opening portions to respective outside positions outside an apparatus main body. In the color electrophotographic image forming apparatus, the plurality of cartridges are removably mounted to the apparatus main body to form an image on a recording medium. The color electrophotographic image forming apparatus includes a cartridge tray, which is movable, while supporting the plurality of cartridges, between an inside position positioned inside the apparatus main body and the outside positions, a plurality of opening portions provided in the apparatus main body, through which the cartridge tray is movable between the inside position and the outside positions, and doors for opening and closing the plurality of opening portions.