To control light accurately at a high speed without increasing the size of a device and the number of the parts.

An electronic endoscope comprises a signal processing means for performing a prescribed processing on output signals of an image pickup device, a luminance signal extracting means for extracting unprocessed luminance signals in a step before performing a prescribed processing from the output signals, and a luminance signal superimposing means for superimposing the extracted unprocessed luminance signal on the processed luminance signal subjected to a prescribed processing and for outputting to the outside devices.