Electric charges, which have been generated in a recording photo-conductor layer having been exposed to radiation, are accumulated at an accumulating section. The accumulated electric charges combine with electric charges, which are generated in a reading photo-conductor layer when the reading photo-conductor layer is exposed to reading light having passed through each of transparent linear electrodes, and an electric current in accordance with a radiation dose flows through each of the transparent linear electrodes. An opaque good electrically-conductive member extends at a middle region of each of the transparent linear electrodes, the middle region being other than an end region extending along a longitudinal direction of each of the transparent linear electrodes.