A radiation detector which has a portion wherein a substrate having a pixel area that is provided with a plurality of pixels which store charges generated in accordance with light that is converted from radiation, a conversion layer that converts radiation into light, a reflective adhesive layer that reflects the light converted by the conversion layer, and a bonding layer that covers a region which ranges from an end of the adhesive layer to the surface of the substrate are sequentially formed in this order.本發明的放射線檢測器具有依序設置有如下之部分：基板，在像素區域形成有蓄積依據從放射線轉換之光而產生之電荷之複數個像素；轉換層，將放射線轉換為光；反射性黏著層，反射被轉換層轉換之光；及黏接層，覆蓋包括黏著層的端部至基板的表面之區域之區域。
