A paper transportation device includes a paper guide body, which forms an inner guide surface of a transportation path, side frames on which a shaft of a transportation member disposed in the transportation path for transporting an original document is mounted and a gear shaft of a drive transmitting gear, which is provided in a standing condition on the side frames and transmits rotation of a drive source to the shaft of the transportation member. The paper guide body, the side frames and the gear shaft are formed integrally by resin.