Patent ID: 8401440

Claim:
A developing device, comprising: a first developer holding body comprising a first cylinder member that is disposed facing the outer peripheral surface of a rotating latent image holding body and rotates such that a movement direction of the first cylinder member at a position facing the latent image holding body is the opposite direction to that of the latent image holding body, and a first magnet that is disposed at the inside of the first cylinder member and generates a magnetic field distributed along a circumferential direction at the outside of the first cylinder member, the first developer holding body holding a developer, for developing a latent image on the latent image holding body; a second developer holding body comprising a second cylinder member that is disposed facing the outer peripheral surface of the latent image holding body, further to the downstream side in the rotation direction of the latent image holding body than the first developer holding body, and rotates such that a movement direction of the second cylinder member at a position facing the latent image holding body is the same direction as that of the latent image holding body, and a second magnet that is disposed at the inside of the second cylinder member and generates a magnetic field distributed along a circumferential direction at the outside of the second cylinder member, the second developer holding body holding the developer, for developing the latent image on the latent image holding body; and an adjustment mechanism that adjusts the relative position of the first magnet to the second magnet in a circumferential direction.