Patent ID: 8155567

Claim:
A developing device comprising: a developing chamber in which a developing agent carrier is disposed, the developing chamber having one end and another end opposite to the one end in a longitudinal direction of the developing agent carrier; a developing agent storage chamber disposed above the developing chamber in a gravity direction, the developing agent storage chamber having one end and another end opposite to the one end of the developing agent storage chamber in the longitudinal direction; a partition wall partitioning the developing chamber and the developing agent storage chamber; a first conveying unit that is provided within the developing agent storage chamber and that is configured to convey a developing agent from the one end of the developing agent storage chamber to the other end of the developing agent storage chamber and to supply the developing agent from the developing agent storage chamber to the developing chamber; a second conveying unit that is provided within the developing chamber and that is configured to convey the developing agent from the other end of the developing chamber to the one end of the developing chamber and to supply the developing agent toward the developing agent carrier; and a third conveying unit that is provided between the one end of the developing agent storage chamber and the one end of the developing chamber and that is configured to convey the developing agent from the one end of the developing chamber to the one end of the developing agent storage chamber, wherein the third conveying unit is disposed to be directly opposed to one end of the second conveying unit in a developing agent conveying direction of the second conveying unit, and the developing agent conveying direction of the second conveying unit is perpendicular to a developing agent conveying direction of the third conveying unit.