A developer and a color image forming apparatus are provided. The color image forming apparatus includes a development cartridge including a photosensitive drum and a container which stores toner. A toner cartridge is configured to attach to and detach from the development cartridge which contains the toner. A toner transfer unit rotates to agitate the toner stored in the development cartridge so as to move the toner when the toner cartridge attaches to and detaches from the development cartridge.