Developing apparatus

A developing apparatus comprising:

• a developer carrier configured to carry developer;
• a developer container having a first chamber and a second chamber which forms a circulation passage for the developer in cooperation with the first chamber;
• a first conveying member provided in the first chamber, and including a first conveying unit and, on a downstream side in a first direction, a reverse conveying unit, the first conveying unit being configured to convey the developer in the first direction, and the reverse conveying unit being configured to convey the developer in a second direction opposite to the first direction;
• a second conveying member provided in the second chamber, and configured to convey the developer in the second direction;
• a discharge unit provided in the first chamber at a position on a downstream side of the reverse conveying unit in the first direction, and configured to discharge the developer;
• a partition wall having a first communication port and a second communication port, and configured to partition the first chamber and the second chamber, the developer being delivered from the first chamber to the second chamber through the first communication port, and the developer being delivered from the second chamber to the first chamber through the second communication port;
• and
• a plurality of protruding portions provided so as to oppose the first conveying member at a position above a region between the first conveying unit and the reverse conveying unit in a vertical direction, each of the protruding portions extending along the first direction,
• wherein the plurality of protruding portions are arranged in a row in a direction orthogonal to the first direction.