Abstract: A recording paper roll unit comprises plural recording paper rolls that are held by a common core. The recording paper rolls are covered with a light shielding sheet. When the core is rotated, the recording papers are drawn out from the recording paper rolls. Two images are recorded at a time by exposure to the recording papers. When the recording papers have the same recording characteristics, the exposure condition of an exposure unit becomes the same. When the recording papers have the same length, the recording paper rolls can be used up at the same time. When the recording papers have the same width, two images of the same size are recorded at the same time, and thus it is possible to increase the recording speed.