PROBLEM TO BE SOLVED: To provide a radiation detector assembly of a narrow-frame structure being downsized while protecting a radiation detection panel and a flexible circuit board inside the assembly and reducing a clearance between a side wall of an assembly housing and the radiation detection panel compared with that of the conventional technique.SOLUTION: One end of a flexible circuit board of the radiation detection assembly is connected to a radiation detection panel on an opposite plane to an incident plane through which the radiation enters the radiation detection panel. The flexible circuit board is disposed not to protrude outward from the in-plane of the radiation detection panel viewed in the radiation incident direction from a radiation generation unit. The other end of the disposed flexible circuit board is connected to a control unit.
