A radiation detector includes a flexible substrate, and a sensor board including a layer which is provided on a first surface of the substrate and in which a plurality of pixels, which accumulate electrical charges generated in accordance with light converted from radiation, are formed, a conversion layer that is provided on the first surface side of the sensor board to convert radiation into light, a protective film that covers at least a region ranging from a region that covers the conversion layer to a region at an outer peripheral part of a second surface opposite to the first surface of the substrate, and a supporting member that supports the region of the substrate via the protective film from the second surface side of the substrate.本發明提供一種於感測器基板中使用撓性基材時能夠抑制放射線圖像的畫質下降之放射線檢測器及放射線圖像攝影裝置。一種放射線檢測器10，具備：感測器基板12，包含撓性基材14及形成有設置於基材14的第1面14A且蓄積依據從放射線轉換之光而產生之電荷之複數個像素16之層；轉換層30，設置於感測器基板12的第1面14A側，並將放射線轉換為光；保護膜32，至少覆蓋如下區域，即包含從覆蓋轉換層30之區域到基材14的與第1面14A相反的一側的第2面14B的外周部中的區域17為止之區域；及支撐構件34，從基材14的第2面14B側經由保護膜32支撐基材14的區域17。
