A developing device includes a first chamber, a second chamber, a first inlet portion, a first carrying member and an auxiliary blade. The first chamber receives a developer supplied to a developer holder. The second chamber receives the developer carried from the first chamber after being circulated between the first chamber and the second chamber. The first inlet portion allows the developer to be introduced from the second chamber to the first chamber. The first carrying member is disposed in the first chamber to carry the developer in the first chamber in a first carrying direction. The first carrying member includes a rotating shaft, a spiral blade provided at an outer periphery of the rotating shaft, and the auxiliary blade formed toward an upstream side of the first carrying direction from the spiral blade.