A radiation image photographing system includes: a radiation generator installed on a round visit cart or a transportable radiation generator； and an FPD cassette including a plurality of radiation detecting elements arrayed two-dimensionally, wherein the radiation image photographing system performs videography by photographing a sequence of multiple radiation images using the FPD cassette, and the radiation image photographing system further includes: a calculation device configured to calculate remaining time before the photography of the sequence of multiple radiation images is finished； and a display device configured to display the calculated remaining time.
