PURPOSE: To obtain the image pickup device whose power consumption is reduced.

CONSTITUTION: The image pickup device in which a luminance signal generating processing section 10A obtains a luminance signal Y from a signal inputted from an image pickup element via an A/D converter 20, a color signal separation processing section 10B obtains a color signal and the luminance signal Y is fed to a monitor is provided with power switches 211, 212 used to supply power separately to the luminance signal generating processing section 10A and the color signal separation processing section 10B. Thus, when the picked-up signal is not recorded but monitored only, the operation of the color signal separation processing section 10B not requiring monitoring is stopped to reduce useless power consumption.