A radiographic imaging device including: a detector that detects an irradiation start of radiation irradiated in imaging of a radiographic image； a derivation unit that derives an irradiation amount of radiation that will be irradiated within a specific period of time based on input data； a controller that makes a power supply amount to the detector smaller and lowers detection sensitivity to radiation irradiation start in the detector the larger the radiation irradiation amount derived by the derivation unit； and an imaging unit that images the radiographic image after radiation irradiation start has been detected by the detector.
