PURPOSE: To execute high-performance shading correction by photoelectric-transferring light passing through the corresponding color filter and by correcting its output signal by the correction coefficient signal in a memory circuit, which stores the shading correction coefficient.

CONSTITUTION: A comparator 16 compares a voltage Vo sent from a operation processing circuit 15 with a reference voltage Vr for an uniform reflecting surface by a photoelectric transfer element 1, obtains a correction coefficient making Vo=Vr, and stores it in a memory circuit 9. A correction coefficient Vy and the special correction quantity by color stored in a memory circuit 10 are taken out, and multiplied by multiplier 11. As a result, the shading correction coefficient, where balance between colors is brought into harmony, is stored in a memory circuit 12. When an original is read out, the signal photo-electric-transferred the light passing through the corresponding color filter can be corrected by the correction coefficient stored in the circuit 12.