Developing apparatus

A developing apparatus comprising:

• a rotatable developing member configured to bear and covey developer containing a toner and a carrier so as to develop an electrostatic latent image formed on an image bearing member;
• a developing container configured to accommodate the developer, the developing container comprising a first chamber supplying the developer to the rotatable developing member, a second chamber, and a partition wall separating the first chamber and the second chamber, the developer circulating between the first chamber and the second chamber;
• a first communicating portion configured to allow the developer to move from the second chamber to the first chamber;
• a second communicating portion configured to allow the developer to move from the first chamber to the second chamber;
• a first conveyance screw disposed in the first chamber, and configured to convey the developer in a first direction from the first communicating portion toward the second communicating portion;
• a second conveyance screw disposed in the second chamber, and configured to convey the developer in a second direction from the second communicating portion toward the first communicating portion;
• and
• a third communicating portion disposed downstream of the first communicating portion and upstream of the second communicating portion in the first direction, disposed above a rotational axis of the first conveyance screw and a rotational axis of the second conveyance screw in a vertical direction, and configured to allow air inside the developing container to move between the first chamber and the second chamber,
• wherein an opening portion for discharging the air inside the developing container outside the developing container is disposed above the second chamber in the vertical direction.