PROBLEM TO BE SOLVED: To perform excellent photography even when a radiographic image photographing apparatus is tilted without being limited in a gravity direction.SOLUTION: In a radiographic image photographing system 100 provided with a portable radiographic image photographing apparatus 1 and a portable radiation generator 50 irradiating radiation to a subject H by pointing a radiation source at the same, there are provided: a first inclination angle detection part 25 detecting an inclination angle of the radiographic image photographing apparatus; a second inclination angle detection part 56 detecting an inclination angle of the radiation source of the radiation generator; and a support control part performing photography support processing on the basis of detection by the first inclination angle detection part and detection by the second inclination angle detection part. By inclination angle detection in the radiographic image photographing apparatus 1 and inclination angle detection in the radiation source 51, inclination of one in accordance with the other is possible whichever is arbitrarily inclined.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】重力方向に限定されることなく放射線画像撮影装置を傾斜させた場合でも良好な撮影を可能とする。【解決手段】可搬型の放射線画像撮影装置1と、被検体Hに放射線源を向けて放射線を照射する可搬型の放射線発生装置50とを備える放射線画像撮影システム100において、放射線画像撮影装置の傾斜角度を検出する第一の傾斜角検出部25と、放射線発生装置の放射線源の傾斜角度を検出する第二の傾斜角検出部56と、第一の傾斜角検出部と検出と第二の傾斜角検出部の検出に基づいて撮影支援処理を行う支援制御部とを備えることを特徴とする。放射線画像撮影装置1における傾斜角度検出と放射線源51における傾斜角度検出とにより、いずれかを任意に傾斜させた場合でも他方をこれに合わせて傾斜させることが可能となる。【選択図】図1