Patent ID: 8457533

Claim:
A developing device comprising: a developer holder that rotates while holding developers on a surface thereof; a first chamber that contains the developers supplied to the developer holder; a second chamber that contains the developers carried from the first chamber after being circulated between the first chamber and the second chamber; a first inlet portion that connects the first chamber and the second chamber, and at least a part of the first inlet portion overlapping a developer-holding portion of the developer holder; a second inlet portion that connects the first chamber and the second chamber; a first carrying member that is disposed in the first chamber, and that carries the developers in the first chamber in a first carrying direction directed toward the second inlet portion; a feeding blade that is provided at the upstream end portion of the first carrying direction of the first carrying member; and a second carrying member that is disposed in the second chamber, and that carries the developers in the second chamber in a second carrying direction directed toward the first inlet portion, wherein the first carrying member includes (i) a rotating shaft, (ii) a spiral blade provided at an outer periphery of the rotating shaft, and (iii) an auxiliary blade formed toward an upstream side of the first carrying direction from the spiral blade wall, a downstream end of the auxiliary blade being connected to the spiral blade, and a gap is formed between an upstream end of the auxiliary blade and the spiral blade wall in the first carrying direction; and a gap is formed between a downstream end of the feeding blade and the spiral blade wall in the first carrying direction.