To provide a charging device and an image forming apparatus that can restrict generation of a winding-seam irregularity of a roll brush for a long period. A charging device 2 is configured so that, when first and second charging members 21a and 21b perform charging processing on a rotating photosensitive member 3, a region 40a on a surface of the photosensitive member 3 facing a winding seam 35a, which is a seam of a base cloth 31 serving as a base material of the first charging member 21a, is not superposed on a region 40b on the surface of the photosensitive member 3 facing a winding seam 35b, which is a seam of a base cloth 31 serving as a base material of the second charging member 21b.