PROBLEM TO BE SOLVED: To provide a radiation imaging apparatus with a thick scintillator layer, which offers excellent sharpness and DQE by increasing the amount of light entering a photoelectric conversion element 112.SOLUTION: An imaging device 100 includes: a photoelectric conversion element 112； and a wavelength conversion layer 120 over the photoelectric conversion element 112 containing fluorescence substance and receiving radiation entrance in the upper surface, the wavelength conversion layer 120 having optical transmitting properties at least in a region aligned with the upper part of the photoelectric conversion element 112, and the region having the fluorescence substance in an area of the region near the lower surface in a concentration smaller than in an area near the upper surface in a thickness direction of the region.SELECTED DRAWING: Figure 2【課題】シンチレータ層を厚膜状態に形成するも、光電変換素子１１２に入射する光量を向上させて鮮鋭性が高く且つＤＱＥの優れた放射線撮像装置を実現する。【解決手段】撮像装置１００は、光電変換素子１１２と、下面が光電変換素子１１２の上方に位置し、上面から放射線が入射する、蛍光体を含む波長変換層１２０とを備えており、波長変換層１２０は、少なくとも光電変換素子１１２の上方に位置整合する領域が光伝達性を有しており、当該領域の厚み方向において、下面側の部分が上面側の部分よりも蛍光体の密度が小さい。【選択図】図２
