To provide an image forming device capable of restricting a positional deviation of a developer image, independently of the thickness of a non-transferring medium when transferring the developed image to a transferred medium.

Resist roller abutment delaying mechanisms 62a and 63a are provided to prevent the extrusion of a rear end of a paper sheet at a moment when the rear end of the paper sheet P, which is conveyed to a fixing device 6 while a toner image is transferred in a transferring position 51, is removed from between rollers 62 and 63 of a pair of resist rollers 61. Thereby, the paper sheet conveying speed can be prevented from being rapidly increased at a moment when the rear end of the paper sheet is removed from between the rollers of the pair of resist rollers.