IMAGE FORMATION DEVICE, DRUM CARTRIDGE, AND DEVELOPMENT CARTRIDGE

To provide an image forming apparatus in which a solvent cartridge that can accommodate therein solvent can be replaced independently of a developing cartridge. An image forming apparatus 1 includes: a main casing 2; a photosensitive drum 4; a developing cartridge 7; a transfer unit 8; an applicator 9; and a solvent cartridge 24. The developing cartridge 7 supplies toner onto the photosensitive drum 4. The transfer unit 8 transfers the toner that has been supplied onto the photosensitive drum 4 to a sheet S. The applicator 9 applies solvent to the toner that has been transferred to the sheet S. The solvent cartridge 24 can accommodate therein the solvent. The solvent dissolves the toner. The solvent cartridge 24 is detachably attachable to the main casing 2 independently of the developing cartridge 7. In a state where the developing cartridge 7 and the solvent cartridge 24 is attached to the main casing 2, the solvent cartridge 24 is positioned away from the developing cartridge 7 in a first direction.