Image forming device and image bearing member unit

An image forming device comprising:

• a plurality of image bearing members juxtaposed with one another and arranged in a first direction,
• an endless belt configured to confront each of the plurality of image bearing members arranged in the first direction and to receive developing agent from the plurality of image bearing members;
• a plurality of developing agent containers each of which is configured to contain a corresponding one of a plurality of colors of developing agents to be supplied to a corresponding one of the plurality of image bearing members, the plurality of developing agent containers being juxtaposed with one another and arranged in the first direction;
• a cleaning member configured to remove the plurality of colors of developing agents from the endless belt;
• a return mechanism configured to convey the plurality of colors of developing agents removed by the cleaning member to one of the plurality of developing agent containers;
• and
• a waste chamber configured to contain the plurality of colors of developing agents removed by the cleaning member and conveyed by the return mechanism,
• wherein the one of the plurality of developing agent containers includes a wall defining both a side of a supply chamber configured to contain the corresponding one of the plurality of colors of developing agents to be supplied and a side of the waste chamber,
• wherein each other ones of the plurality of developing agent containers has a supply chamber configured to contain the corresponding one of the plurality of colors of developing agents to be supplied, and
• wherein the waste chamber is disposed at a position farther in the first direction than each of the supply chambers.