To suppress the occurrence of a so-called hollow character after keeping the circumferential speeds of a photoreceptor drum and transfer roller to be equal to each other, when transferring a toner image on a hard sheet of paper, such as an OHP film, concerning an image forming device of a type which transfers the toner image formed on the photoreceptor to the recording medium while supporting the recording medium between the photoreceptor and photoreceptor drum transfer roller.

When using the OHP film or the like, an electrostatic latent image thinned out every other one dot is formed.