PURPOSE: To attain excellent color reading without color shear and out of focusing by providing a mechanism for adjusting tilt of a 3-line sensor onto a main body.
CONSTITUTION: A 3-line sensor is supported to a main body by a sensor support 8 and devised to be tilted in forward and backward directions around a support pin 9. Moreover, the tilt is adjusted by an adjustment screw 10. Picture information of an original face 12 is scanned by a mirror arranged with an image forming optical system 11 and the image is formed on line sensors 2-4 on the monolithic 3-line sensor 1 via the image forming optical system 11. In this case, the said adjustment mechanism is used to form image so that the image is formed on each line sensor without out of focusing.