An image forming apparatus is disclosed, that includes multiple imaging units, a loading unit formed on the top face of the main body of the image forming apparatus, and a discharging unit disposed at the operation side of the main body. The image forming apparatus further includes multiple developer containing members disposed in the main body for providing the corresponding imaging units with developer, the developer containing members being arranged in a direction extending from the operation side of the main body. The developer containing members are detachable from the main body of the image forming apparatus, and can be handled in a space above the image forming apparatus, the space being limited to the width of the main body.