An image-forming device includes: a main body; a plurality of developer cartridges; a belt; a holder; and a plurality of urging members. Each developer cartridge has a photosensitive drum. The belt is configured to contact the photosensitive drums of the developer cartridges. The holder is configured to move between a position inside the main body and a position outside the main body and to hold the developer cartridges such that the developer cartridges are arranged in a row along a first direction. The plurality of urging members are configured to urge the developer cartridges to cause the photosensitive drums to contact the belt when the holder is at the position inside the main body.