A developing device includes: a first developer holding body with a first cylinder member disposed facing the outer peripheral surface of a rotating latent image holding body, and a first magnet disposed at the inside of the first cylinder member; a second developer holding body with a second cylinder member disposed facing the outer peripheral surface of the latent image holding body, further downstream in the latent image holding body rotation direction than the first developer holding body, and a second magnet disposed at the inside of the second cylinder member; and an adjustment mechanism that adjusts the relative position of the first magnet to the second magnet in a circumferential direction.