Radiographic image capturing apparatus 1 is connected to the opposite end and a gate driver 15b to switch on / off the switching means 8 through the scanning lines 5 and the end of the scanning line 5 which is connected to a gate driver 15b , includes a current detector 43 for detecting a current flowing through each scan line 5, and control means 22 for detecting the start of irradiation of radiation based on the value of current at which the current detecting means 43 detects, the control means 22, the gate Upon detecting the start of the exposure to radiation during the reset process of the radiation detection element 7 which is performed while giving sequentially switching the scanning line 5 for switching between an off-voltage and on-state voltage and the voltage applied from the driver 15b, the switching means 8 by causing the off state, and is stored in the radiation detection element 7 in the charge generated in 7 within each of the radiation detection element upon exposure to radiation.放射線画像撮影装置1は、走査線5を介してスイッチ手段8にオン/オフを切り替えるゲートドライバ15bと、ゲートドライバ15bが接続された走査線5の端部とは反対側の端部に接続され、各走査線5を流れる電流を検出する電流検出手段43と、電流検出手段43が検出した電流の値に基づいて放射線の照射開始を検出する制御手段22とを備え、制御手段22は、ゲートドライバ15bから印加する電圧をオン電圧とオフ電圧との間で切り替える走査線5を順次切り替えさせながら行う各放射線検出素子7のリセット処理の際に放射線の照射の開始を検出すると、各スイッチ手段8をオフ状態とさせて、放射線の照射により各放射線検出素子7内で発生した電荷を各放射線検出素子7内に蓄積させる。
