An image-scanning device wherein plural images of an object are picked up inverted and reduced in size by image-forming optical systems arranged to be adjacent to each other, and then restored by an image processing system. Each optical system includes a first optical element having a first focal length; an aperture member located at a focus position in a rear side of the first optical element; and a second optical element provided in a rear side of the aperture member and having a second focal length shorter than the first focal length, respectively disposed from a side of the object being picked up to a side of the image pickup device. In between optical systems, corresponding image pick up devices thereof are arranged to be adjacent to each other, the image pickup devices including a region in which the images picked up by the image pickup devices are overlapped.