An image input device comprises a mirror body which is designed in a polygonal
prism form and has side peripheral surfaces each formed of a mirror face, image
pickup light from a subject being reflected from the mirror face, and a linear
sensor for talking the image pickup light reflected from each mirror face of the
mirror body to perform photoelectric conversion on the image pickup light. The
mirror body is arranged so that the length direction thereof is substantially parallel
to the length direction of the linear sensor, and disposed so as to be rotatable
around a shaft at the center of the bottom surface which are substantially perpendicular
to the length direction of the mirror body.
