Patent ID: 8086145

Claim:
A developing device comprising: a housing that stores a developing agent including toner and a carrier and that is replenished with the toner and the carrier; an agitation conveyance member that rotates the developing agent stored in the housing, so as to agitate and convey the developing agent; a developing agent supply member that supplies to a developing area the developing agent conveyed by the agitation conveyance member while rotating the developing agent; a first outlet that is connected to a recovery device and that discharges outside of the housing a superfluous developing agent of the developing agent stored in the housing, the recovery device transferring and collecting the discharged superfluous developing agent, wherein the superfluous developing agent is in excess of a first set storage capacity; a second outlet that discharges outside of the housing an excessive developing agent of the developing agent stored in the housing, wherein the excessive developing agent is in excess of a second set storage capacity that is larger in amount than the first set storage capacity; a container that stores the excessive developing agent discharged from the second outlet; and a detection unit that detects the excessive developing agent stored in the container.