To provide an image forming device capable of preventing functional reduction by excessive operation while restraining a cost increase by a simple constitution.

This image forming device controls a carrying starting interval of paper for lengthening, when a detected driving load exceeds a predetermined limit load in at least one of object members, by detecting the driving load based on a driving time of the object member with at least one as the object member among driving members arranged along a paper carrying passage and controlling the carry of paper in a corresponding carrying passage.