Tilt angle and tilt direction of lenticular lenses are detected precisely to correct attitude of a transported lenticular sheet with high accuracy. At least first to third lens sensors are disposed in a transport track of the lenticular sheet, aligned in a main scan direction and spaced at uneven intervals. Each lens sensor has a light-emitting element and a light-receiving element arranged to sandwich the lenticular sheet and output a detection signal corresponding to concavities and convexities of the lenticular lenses. During the transport of the lenticular sheet, the detection signals output from the first to third lens sensors are analyzed to detect the tilt direction and the tilt angle of the lenticular lenses accurately. Based on the tilt direction and the tilt angle, the attitude of the lenticular sheet is corrected in advance, preventing the lenticular sheet from skewing while stripe images are being recorded thereon.