PROBLEM TO BE SOLVED: To provide a radiation detector capable of improving reliability. A radiation detector according to an embodiment is provided between a base portion and a photoelectric conversion unit provided on one side of the base portion and having a plurality of photoelectric conversion elements, and between the base portion and the photoelectric conversion unit. A protective film having a peripheral end surface that integrally covers a joint portion located on the center side of the photoelectric conversion portion with respect to the peripheral end surface of the photoelectric conversion portion, and the base portion and the photoelectric conversion portion joined by the joint portion. And a scintillator on the protective film and covering the region where the plurality of photoelectric conversion elements are provided in a plan view. [Selection diagram] Fig. 4【課題】信頼性を向上させることができる放射線検出器を提供することである。【解決手段】実施形態に係る放射線検出器は、基部と、前記基部の一方の側に設けられ、複数の光電変換素子を有する光電変換部と、前記基部と、前記光電変換部との間に設けられ、周端面が、前記光電変換部の周端面よりも前記光電変換部の中心側に位置する接合部と、前記接合部により接合された前記基部および前記光電変換部を一体に覆う保護膜と、前記保護膜の上であって、平面視において、前記複数の光電変換素子が設けられた領域を覆うシンチレータと、を備えている。【選択図】図４
