Developing apparatus

A developing apparatus comprising:

• a rotatable developing member configured to carry and feed a developer containing toner and carrier to develop an electrostatic latent image formed on an image carrying member;
• and
• a magnet provided non-rotatably and stationarily inside the rotatable developing member and configured to include a first magnetic pole and a second magnetic pole that is provided adjacent to the first magnetic pole at a downstream side of the first magnetic pole with respect to a rotation direction of the rotatable developing member and has the same polarity as the first magnetic pole,
• wherein a distance along an outer peripheral surface of the rotatable developing member between a first maximum peak position, which corresponds to a maximum value of a magnetic flux density of the first magnetic pole with respect to a normal direction of the rotatable developing member, and a second maximum peak position, which corresponds to a maximum value of a magnetic flux density of the second magnetic pole with respect to the normal direction of the rotatable developing member, is less than 18 [mm], and
• wherein, in a case where a direction of a force by which a magnetic attraction in the normal direction of the rotatable developing member attracts the developer in a central direction of the rotatable developing member is negative, a distance along the outer peripheral surface of the rotatable developing member in a repulsion width in which the magnetic attraction in the normal direction of the rotatable developing member is a positive value at a downstream side of the first maximum peak position and at an upstream side of the second maximum peak position with respect to the rotation direction of the rotatable developing member is greater than or equal to 4.7 [mm].