A photoelectric conversion device adopts the structure reflecting the finding that color separation by the photoelectric conversion, which utilizes the difference of the PN junction depth of a semiconductor region, has the strong tendency that separation of a B signal is easy but separation of a G signal and an R signal becomes imperfect. That is, to cope with the tendency of the imperfect color separation of a G signal and an R signal, PN junction surfaces (JNC_B, JNC_R) of two photodiodes (PDs) for R light and B light are superimposed in the depth direction, and PD to G light is arranged independently. Accordingly, the color separation property of each RGB light wavelength band can be improved, the occupying area can be reduced compared with the case where each PD of RGB light is dispersed in the plane direction, and simplification of the semiconductor layer structure can be realized.