An image pickup device comprises an image pickup tube having a target scanned by an electron beam and a pair of electrodes which form a collimation, a voltage applying circuit for respectively applying predetermined voltages for forming the collimation to the collimation forming electrodes of the image pickup tube, and a correction voltage applying circuit for applying a correction voltage which varies the voltage ratio of the collimation forming electrodes to one of the collimation forming electrodes, upon scanning of the peripheral parts of an effective scanning surface of the target by the electron beam. The collimation is formed responsive to a voltage ratio of the voltages applied to each of the collimation forming electrodes and changed in response to the correction voltage.
