A complete-contact type image sensor includes matrix-driven sensor elements arranged on a light transmitting substrate. Both input contact members connected with the sensor elements at their input side and output contact members connected with the sensor elements at their output side are formed at one same side on the light transmitting substrate. By virtue of this arrangement, the sensor elements and an original are brought into close contact, thereby improving the MTF (Modulation Transfer Function) and reducing the width of the light transmitting substrate.