An image forming device includes: an exposure head having a plurality of light emitting elements arranged in a first direction, a first imaging optical system adapted to image light emitted from the light emitting elements, and a second imaging optical system disposed in a second direction with respect to the first imaging optical system; a latent image carrier movable in the second direction; a detection section adapted to detect a moving time the latent image carrier takes to move from a first position to a second position in the second direction; and a control section adapted to control the time from emission of a first part of the light emitting elements adapted to emit light to be imaged by the first imaging optical system to emission of a second part of the light emitting elements adapted to emit light to be imaged by the second imaging optical system based on the detection result of the detection section, thereby aligning a latent image formed on the latent image carrier by the first imaging optical system and a latent image formed on the latent image carrier by the second imaging optical system in the first direction.