An image forming device includes: a main unit case; a process unit; a belt unit; a belt; a belt cleaning unit; a storing unit; and a duct unit. The process unit is configured to be attached to and detached from the main unit case. The belt unit is configured to displace between an opposed position and an opened position. The belt unit in the opposed position is opposed to the process unit. The belt unit in the opened position allows the process unit to be exposed in the direction of removing the process unit from the main unit case. The belt is provided on the belt unit and is rotatingly driven. The belt cleaning unit is fixedly attached to the belt unit and removes material adhered to the belt. The storing unit is fixedly attached to the main unit case and stores therein the material removed from the belt by the belt cleaning unit. The duct unit has a conveying path in fluid communication with the belt cleaning unit and the storing unit. The duct unit conveys, along the conveying path, the material removed by the belt cleaning unit from the belt cleaning unit to the storing unit.