A radiological imaging apparatus which can keep detectors at a low temperature, improve a time resolution and an energy resolution and perform an accurate diagnosis is provided. In the radiological imaging apparatus, an imaging apparatus imaging a testing subject supported by a bed couples a detector board having placed thereon radiation detectors detecting radiations emitted from the testing subject and a signal processing board having placed thereon a signal processing circuit processing detection signals of the radiation detectors via an intermediate board by connectors, and separates a detector space including the radiation detectors and a signal processing circuit space including the signal processing circuit.