Abstract: A photoelectric conversion apparatus is provided which includes a substrate at least a surface of which has an insulating property, a plurality of unit photoelectric conversion elements each comprising at least a lower electrode, a photoelectric conversion layer, and an upper electrode that are formed in this order on the front surface of the substrate, and a plurality of rear electrodes formed on the rear surface of the substrate. In this apparatus, the lower electrode and upper electrode of each unit photoelectric conversion element are connected to a corresponding one of the rear electrodes through an aperture formed through the substrate, such that the unit photoelectric conversion elements are connected in series. Each of the rear electrodes comprises a first connecting electrode and a second connecting electrode.