PURPOSE: To facilitate the signal processing which follows and enable to drive each solid-state image pickup element at high frequency independently of its number, in a photoelectric conversion device wherein the solid-state image pickup elements are arranged linearly.

CONSTITUTION: A clear pulse R is generated from a pulse generation circuit 2 immediately before the fall of each scanning drive pulse 1∼n, and a switch 7 is turned ON by this clear pulse R. The photocurrent generated from each solid-state image pickup element 11∼1n is successively extracted to an output video line 4 by a method wherein switches 31∼3n are successively turned ON- OFF by the scanning drive pulses 1∼n generated successively from the pulse generation circuit 2. This video line 4 has a floating capacitor Cv, and the converted current is charged into this capacitor Cv. Thereby, the signal processing which follows is facilitated, and each solid-state image pickup element can be driven at high frequency regardless of its number.