A radiographic apparatus includes a columnar crystal phosphor which converts X-rays into visible light, a photodetector which converts the visible light into an electrical signal, and a case (a case lid and case main body) which houses the columnar crystal phosphor and photodetector. A buffer member which buffers a force from outside the case (the case lid and case main body) and a highly rigid member which has higher rigidity than that of the columnar crystal phosphor are arranged between the case (the case lid and case main body) and columnar crystal phosphor.