Developing device and image forming apparatus

A developing device comprising:

• a first developing roller arranged so as to face an outer peripheral surface of a photoconductor, which rotates, at a downstream position in a rotation direction of the photoconductor, the first developing roller including a first sleeve and a first magnet, the first sleeve holding developer for developing an image on the photoconductor and rotating in a direction opposite to the rotation direction of the photoconductor, and the first magnet being disposed in the first sleeve and having a magnetic flux density distribution in a circumferential direction of the first sleeve;
• a second developing roller arranged so as to face the outer peripheral surface of the photoconductor at an upstream position in the rotation direction of the photoconductor, the second developing roller including a second sleeve and a second magnet, the second sleeve holding the developer for developing the image on the photoconductor and rotating in the same direction as the rotation direction of the photoconductor, and the second magnet being disposed in the second sleeve and having a magnetic flux density distribution in a circumferential direction of the second sleeve;
• a trimmer that is arranged so as to face an outer peripheral surface of the first developing roller and that regulates formation of a layer of the developer held by the first developing roller;
• a divider that divides the developer regulated by the trimmer into developer that adheres to the first developing roller and developer that adheres to the second developing roller;
• and
• a movement regulator that is disposed between the trimmer and the divider and that regulates movement of the developer held by the first developing roller before the developer is divided.