A transfer device including an intermediate transfer belt provided to extend in an arranged direction of a plurality of photosensitive drums, and primary transfer rollers each transferring a toner image formed on a corresponding one of the plurality of photosensitive drums to the intermediate transfer belt, each of the primary transfer rollers being moved between a position causing the intermediate transfer belt to be in contact with the photosensitive drums and a position causing the intermediate transfer belt to be separated from the photosensitive drums, each of the primary transfer rollers being rotatably supported by a movable member which includes an abutting portion which regulates a position of the primary transfer roller, the abutting portion abutting on an abutted member whose positional relationship with the photosensitive drum is defined such that the position of the abutted member causes the intermediate transfer belt to be in contact with the photosensitive drum.