An image processing device according to the present invention generates an image signal on the basis of an electric signal generated by an imaging element in which first pixels that each generate an electric signal for a first brightness component that is the brightness component of white illumination light, and second pixels that each generate an electric signal for a color component including a second brightness component that is the brightness component of narrow-band illumination light are arranged in a matrix configuration, and the density of the first pixels is higher than the density, for each color component, of the second pixels. The image processing device is provided with: an interpolation color difference calculating unit which interpolates an electric signal for the first brightness component at the position of a second pixel, and which generates a color difference signal that is the difference between an electric signal for a brightness component generated through the interpolation and an electric signal for the color component generated by the second pixel a color difference interpolating unit which determines the interpolation direction on the basis of the color difference signal generated by the interpolation color difference calculating unit, and which interpolates the color difference signal lacking at each pixel position and an image signal generating unit which generates an electric signal for the color component to be generated by the second pixel on the basis of the color difference signal obtained through the interpolation and on the basis of the electric signal for the brightness component generated by the interpolation color difference calculating unit.Un dispositif de traitement dimage selon la présente invention génère un signal dimage sur la base dun signal électrique généré par un élément dimagerie dans lequel des premiers pixels qui génèrent un signal électrique pour une première composante de luminosité étant la composante de luminosi
