An aim of the present invention is to improve the conversion efficiency of scintillation light into electric charge by a photoelectric conversion element in an imaging panel of an X-ray imaging system using an indirection conversion scheme. An imaging panel generates images based on scintillation light acquired from X-rays that have passed through a specimen. The imaging panel includes a substrate, thin film transistor, photoelectric conversion element, and reflective layer. The thin film transistor is formed on the substrate. The photoelectric conversion element is connected to the thin film transistor and converts incident scintillation light into electric charge. The entirety of a region of a light-receiving surface of the photoelectric conversion element where the scintillation light is incident overlaps the reflective layer as seen from the incident direction of the scintillation light. The reflective layer may be the drain electrode. Alternatively, the reflective layer may be a reflective electrode that is formed in the same layer as a gate electrode.