A developing device includes a developing container, a rotatable developing member to carry and feed the developer to a developing position, a magnet provided non rotatably and stationarily inside the rotatable developing member and provided with a regulating pole, and a regulating portion to regulate an amount of the developer carried on the rotatable developing member by a magnetic force of the regulating pole. With respect to a rotational direction of the rotatable developing member, a local minimum position, where a magnetic flux density of the regulating pole in a normal direction is a local minimum value, is downstream of a first local maximum position where the magnetic flux density of the regulating pole in the normal direction is a first local maximum value, and is upstream of a second local maximum position where the magnetic flux density of the regulating pole is a second local maximum value.