When charging only, or when charging and shooting with an external power supply in the immediate vicinity, high-speed charging with a large current is possible, and when shooting, etc., the handling is good and the image quality deteriorates. Also provided is a radiological image detection apparatus that does not generate any problems. The radiographic image detection apparatus for that purpose is a cassette type radiographic image detection apparatus 2 that can be driven by power supply from a built-in battery 28 and can be electrically connected to the output connector section 42 or the power supply cable 52 of the cradle 4. The detection device side connector portion 26 configured to receive power from the outside, the two types of charging paths for guiding the charging current from the detection device side connector portion 26 to the battery 28, and the cradle 4 and the power supply cable 52 are either the detection device side connector. Power supply means determination means for determining whether or not connected to the unit 26, and charging path switching means for switching the charging path according to the determination result.充電のみを行う場合、または外部電源と直近で接続して充電及び撮影等を行う場合は、大電流による高速充電が可能であるとともに、撮影等を行う場合には取り廻しがよく、画質の劣化も生じない放射線画像検出装置を提供する。そのための放射線画像検出装置は、内蔵するバッテリ28からの電力供給による駆動が可能なカセッテ型の放射線画像検出装置2であって、クレードル4の出力コネクタ部42又は給電ケーブル52と電気的に接続可能に構成され外部から受電を行う検出装置側コネクタ部26と、検出装置側コネクタ部26からバッテリ28まで充電電流を導く2種類の充電経路と、クレードル4及び給電ケーブル52のいずれが検出装置側コネクタ部26に接続されたかを判定する給電手段判定手段と、この判定結果に応じて充電経路を切り替える充電経路切替手段と、を備えている。