PROBLEM TO BE SOLVED: To provide a radiation detector and a radiation image photographing device that can prevent image quality of a radiation image from deteriorating if a flexible base material is used for a sensor substrate.SOLUTION: A radiation detector 10 includes: a sensor substrate 12 including a flexible base material 14 and a layer which is provided on a first face 14A of the base material 14 and on which formed are a plurality of pixels 16 storing charges occurring in response to light into which a radiation is converted a conversion layer 30 provided on the side of the first face 14A of the sensor substrate 12 for converting a radiation into light a protection film 32 for at least covering a region from a region covering the conversion layer 30 to a region 17 on the outer periphery of a second face 14B opposite to the first face 14A of the base material 14 and a support member 34 for supporting the region 17 of the base material 14 via the protection film 32 from the second face 14B side of the base material 14.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2019,JPO&INPIT【課題】センサ基板に可撓性の基材を用いた場合に、放射線画像の画質の低下を抑制することができる放射線検出器及び放射線画像撮影装置を提供する。【解決手段】放射線検出器10は、可撓性の基材14、及び基材14の第1の面14Aに設けられ、かつ放射線から変換された光に応じて発生した電荷を蓄積する複数の画素16が形成された層を含むセンサ基板12と、センサ基板12の第1の面14Aの側に設けられた、放射線を光に変換する変換層30と、少なくとも、変換層30を覆う領域から基材14の第1の面14Aとは反対側の第2の面14Bの外周部における領域17までを含む領域を覆う保護膜32と、基材14の第2の面14B側から保護膜32を介して基材14の領域17を支持する支持部材34と、を備える。【選択図】図3
