PURPOSE: To improve efficiency on document input by providing an original holding part, an original driving part, and a mounting part to be mounted on a word processor on the upper side of a display screen.

CONSTITUTION: The original holding part is formed by mounting rubber rollers 2, 3 rotatably on an original supporting device main body 1 with rotary shafts, 9,10, 11 and a rotary driving shaft 8. The original supporting device main body 1 is provided with the mounting parts 4. 5 to be mounted on the word processor and attaching screws 6, 7 on the right and left sides. The rubber roller 2 is linked to a rotary driving roller 12 with the rotary driving shaft 8. In such a case, an original 14 is inserted between the rubber rollers 2 and 3. A present input line on the original can be located at a position nearest to the display screen 15 by rotating an operator 15 and the rotary driving roller 12.