A radiographic imaging system includes a radiographic imager, an optical imager and an optical imaging condition setter. The radiographic imager detects radiation emitted from a radiation source and passed through a subject to take a radiograph. The optical imager takes an optical image of a region including a region to which the radiation is emitted from the radiation source. The optical imaging condition setter sets an optical imaging condition of the optical imager based on a radiographic imaging condition for the radiograph.