A radiological image reading device 20 includes a MEMS mirror 4 that scan a recording medium on which a radiological image is recorded with excitation light； a light detecting element 6 that includes a plurality of channels, each channel including a photodiode array 10, and detects light emitted from an irradiation position of the excitation light on the recording medium； a MEMS mirror driving circuit 15 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 12 that reads the detection result of the light from the channel determined by the MEMS mirror driving circuit 15.
