An image processing device includes a color temperature estimating unit configured to estimate a color temperature of a light source in imaging, a white balance adjusting unit configured to perform first white balance adjustment in which white balance of an image signal is adjusted on the basis of the estimated color temperature when the estimated color temperature is within a predetermined color temperature range, and perform second white balance adjustment in which the white balance of the image signal is adjusted on the basis of the estimated color temperature even when the estimated color temperature is not within the predetermined color temperature range, and a color region extracting unit configured to extract a color region of a specific color by using the image signal to which the second white balance adjustment is applied.