A medical image radiographing system has a medical image reading apparatus to read out identification information of a cassette and a medical image from the cassette recording the medical image radiographed according to radiographing order information, a portable radiographing information apparatus having a correspondence setting section to set correspondence of the identification information of the cassette to the radiographing order information for radiographing using the cassette, and a judging section to judge whether or not the cassette is usable for next radiographing. The correspondence setting section prohibits the setting of the correspondence of the identification information of the cassette, which is judged by the judging section to be nonusable for the next radiographing, to the radiographing order information.