an image information reading device is provided , which includes a scanner for reading image information and a scanner guide for guiding the scanner . the scanner has a light source , a line sensor for receiving beams of light reflected by an object to be read from beams of light emitted by the light source to generate image information as the scanner is moved and the object to be read is scanned in a vertical scanning direction orthogonal to a horizontal scanning direction of the line sensor . the scanner guide is formed with a guide frame portion which abuts the scanner . the guide frame portion has first and second straight portions formed respectively along the horizontal and vertical scanning directions of the scanner in correspondence with the range which can be read by the scanner and comprises a transparent flat plate portion formed between the first and second straight portions . the scanner is manually moved in the vertical scanning direction along the second straight portion on a flat surface portion of the scanner guide to read the image information on the object to be read .