A radiological image detection apparatus includes: a phosphor which contains fluorescent material emitting fluorescence in response to radiation exposure; a sensor portion of thin-film type that is provided adjacent to a radiation entering side of the phosphor and supported by the phosphor and that detects fluorescence emitted by the phosphor; and a moisture preventing portion that covers at least a part of a rear face opposite to a phosphor side of the sensor portion so as to suppress entering of moisture into the sensor portion.