A radiological image reading device includes a MEMS mirror that scan a recording medium on which a radiological image is recorded with excitation light； a light detecting element that includes a plurality of channels, each channel including a photodiode array, and detects light emitted from an irradiation position of the excitation light on the recording medium； a MEMS mirror driving circuit that determines as a light detection channel to detect the light, a channel corresponding to the irradiation position of the excitation light, out of the plurality of channels； and a reading circuit that reads the detection result of the light from the channel determined by the MEMS mirror driving circuit.
