PROBLEM TO BE SOLVED: To provide a radiation image capturing apparatus capable of achieving power saving of a built-in power supply in the radiation image capturing apparatus including the built-in power supply.SOLUTION: A radiation image capturing apparatus 1 includes a power supply circuit 31 capable of switching load modes between a low load mode A which can supply only a current with a low current value I to a radio communication unit 30 but has high power supply efficiency E and a high load mode B which can supply a current of a current value I higher than that of the low load mode A, but in a situation where a current with a low current value I is supplied, shows the power supply efficiency E lower than that of the low load mode A. Switching means 22, 31a detect or acquire the load state of the radio communication unit 30 and switch the load mode of the power supply circuit 31 on the basis of the detected or acquired load state of the radio communication unit 30.SELECTED DRAWING: Figure 4【課題】内蔵電源を備える放射線画像撮影装置において、内蔵電源の省電力化を図ることが可能な放射線画像撮影装置を提供する。【解決手段】放射線画像撮影装置１は、負荷モードを、無線通信部３０に電流値Ｉが低い電流しか供給できないが電源効率Ｅが高い低負荷モードＡと、低負荷モードＡよりも高い電流値Ｉの電流を供給可能であるが電流値Ｉが低い電流を供給する状態では低負荷モードＡの場合よりも電源効率Ｅが低い高負荷モードＢとの間で切り替え可能な電源回路３１を備え、切替手段２２、３１ａは、無線通信部３０の負荷状態を検知または取得し、検知または取得した無線通信部３０の負荷状態に基づいて電源回路３１の負荷モードを切り替える。【選択図】図４
