IMAGE FORMING DEVICE

PROBLEM TO BE SOLVED: To provide a belt skew correction structure configured to reduce running cost as well as manufacturing cost.SOLUTION: The image forming device 1 includes an endless belt 34 having a skew guide 34a formed at an end in a direction orthogonal to the moving direction thereof, and a skew correction device 33 for preventing skew of the endless belt 34 and correcting it. The skew correction device 33 has a skew correction member 91 which axially moves to the end thereof, reduces tension of the endless belt 34 during skew correction when skew occurs in the endless belt 34, moves the skew correction member 91 to the center of the skew correction device 33, and aligns the central position of the endless belt 34 with the central position of the skew correction device 33.