A radiation detecting apparatus includes a sensor panel 100, a phosphor layer 111 formed on the sensor panel 100 to convert a radiation into light, and a phosphor protecting member 110 covering the phosphor layer 111 to adhere closely to the phosphor protecting member 110. The phosphor protecting member 110 includes a phosphor protecting layer 116 made of vapor deposition polymerization polyimide formed by vapor deposition polymerization, a reflecting layer 113 reflecting the light converted by the phosphor layer 111, and a protecting layer 117 made of vapor deposition polymerization polyurea formed by the vapor deposition polymerization. By such a configuration, a polymerization reaction of the phosphor protecting layer 116 is performed on the substrate. Thereby, the generation of by-products is suppressed to make it easy to acquire the uniformity of film quality. Consequently, the generation of a situation in which structural disorders are generated on the reflection surface of the reflecting layer 113 to cause image defects can be suppressed.