An inverting roller device is used for changing a conveying path of a paper. The inverting roller device includes a first rotating shaft, a first roller, a second rotating shaft, a second roller, and a first swinging arm. The first roller and the second roller are disposed on the first rotating shaft and the second rotating shaft, respectively. The first swinging arm is pivotally disposed on the first rotating shaft and connected with the second rotating shaft. First, the first roller and the second roller are rotated to allow the paper to be moved in a first traveling direction. Then, the rotation of the first roller is temporarily stopped, and the second rotating shaft and the second roller are driven by the first swinging arm to be moved relative to a surface of the first roller. Consequently, the conveying path of the paper is changed.