In an image-forming device, a holder is configured to move between a position inside the main body and a position outside the main body and to hold a first process unit having a first supply roller and a second process unit such that the first and second process units are arranged in a row along a first direction. The holder has a first guide member positioned between the first and second process units in the first direction when the holder holds the first and second process units, the first guide member being configured to guide the first process unit into the holder. An upper end of the first guide member is positioned at a vertical level higher than the first supply roller when the holder holds the first process unit.