Developing device and image forming apparatus including the same

A developing device, comprising:

• a development container that includes a first conveyance chamber and a second conveyance chamber disposed above the first conveyance chamber with a partition portion therebetween, and that holds therein a two-component developer including a carrier and toner.
• a first stirring conveyance member that is rotatably supported inside the first conveyance chamber, and that conveys, while stirring, the developer inside the first conveyance chamber in a first direction;
• a second stirring conveyance member that is rotatably supported inside the second conveyance chamber so as to be parallel to the first stirring conveyance member, and that conveys, while stirring, the developer inside the second conveyance chamber in a second direction that is a direction opposite to the first direction;
• and
• a developer carrying member that is rotatably supported in the development container, and that carries, on a surface thereof, the developer inside the second conveyance chamber,
• the developing device developing an electrostatic latent image having been formed on an image carrying member into a toner image,
• wherein
• the developer carrying member includes:
• a developing sleeve that is rotatable and cylindrical in shape;
• and
• a magnet member that is non-rotatably secured inside the developing sleeve, and that includes a plurality of magnetic poles arranged along a rotation direction of the developing sleeve,
• the magnetic poles include:
• a main pole that faces the image carrying member;
• and
• a peeling pole that is disposed downstream of and adjacent to the main pole in the rotation direction of the developing sleeve, and that peels off the developer carried on the developer carrying member,
• a magnetic-flux-density peak-position of the main pole is located below a horizontal line passing through a rotation center of the developing sleeve, and
• as viewed from an axial direction, an angle that a line extending from the magnetic-flux-density peak-position of the main pole to the rotation center of the developing sleeve forms with respect to the horizontal line passing through the rotation center of the developing sleeve is 40° or larger but 80° or smaller.