An image-forming apparatus includes a main housing, a drum unit, a developing unit, and a seal member. The drum unit includes a photosensitive drum, an inlet port, an outlet port, and a connecting part connecting the inlet port to the outlet port. A toner container storing toner is connectable to the inlet port. The developing unit includes a developing roller, and a supply port connected to the outlet port. The seal member is interposed between the outlet port and the supply port. The seal member is elastically deformable to allow the supply port to move relative to the outlet port. The drum unit and developing unit constitute a process cartridge. In a state where the process cartridge is mounted in the main housing, the inlet port, the outlet port and the supply port at least partially overlap each other when viewed in an up-down direction.