To provide a developing device capable of enlarging the allowable range of various kinds of setting condition in the case of providing a constitution magnetically controlling the developer, selectively applying sufficiently electrified magnetic toner on the developer carrier, and performing a uniform and stable image formation.

The developing device provided with a control area G1 in which the developer is magnetically controlled by a developing sleeve equipped with a permanent magnet 10 therein and a controlling member 2a arranged in non- contact with and opposite thereto, and the control area G2 in which the developer on a developing sleeve is controlled by a magnetic field formed by the permanent magnet 10 and the control sleeve 2b in cooperation therewith, makes a circulating path of the developer formed so that the developer fed from the developer container 5 is fed to the control area G2 in a state of being preliminarily controlled in the control area G1.