PURPOSE: To accurately correct distortion by precisely deciding a scanning state in the middle of scanning and at the time of starting or finishing it by means of a picture input part at the time of manual scanning.

CONSTITUTION: The picture input device of two-line sensor type is provided with a speed deciding means 225 deciding a scanning speed based on characteristic data from two sensors, a stopping state deciding means 226 deciding whether a picture input part 100 is in a scanning stopping state or not, a means 227 deciding a speed before/after the stopping state decided by this way, the scanning start deciding means and the scanning start speed deciding means of the picture input part 100, the scanning finish deciding means and the scanning finish speed deciding means of the picture input part 100, a means updating the writing finishing position of a ring buffer which uses a ring buffer as a buffer 210 storing picture data and updates the writing finishing address of this ring buffer, and a means 240 correcting a picture from information in each speed deciding means of these.