An image-forming device has a main casing, a cartridge, and a guiding unit. The main casing has a cartridge access opening and a cartridge loading section in communication with the cartridge access opening. The cartridge access opening has an opening plane. The cartridge is detachably counted in the cartridge loading section through the cartridge access opening. The guiding unit provides a loading path to load/unload the cartridge with respect to the cartridge loading section. The guide unit is configured to orient the loading path toward a direction substantially parallel to the opening plane outside of the main casing, thereby curving a track of the cartridge.