PROBLEM TO BE SOLVED: To provide an electronic cassette and a radiographic image capturing system shutting down a power supply when a handle is inserted.SOLUTION: A radiographic image capturing system 40 includes: a housing 42 storing radiation detecting means 52 that detects radiation transmitting through a subject not shown a power supply 20 that is provided inside the housing 42 and supplies the radiation detecting means 52 with a power a connecting part 14 that is formed in the housing 42 and on which a carrying handle 12 is mounted and power shutdown means 16 that is provided on the connecting part 14 and, when the handle 12 is mounted, shuts down the supply of the power from the power supply 20.COPYRIGHT: (C)2013,JPO&INPIT【課題】ハンドルが差し込まれたきに電源を遮断する電子カセッテ及び放射線画像撮影システムを提供する。【解決手段】放射線画像撮影システム40は、図示しない被写体を透過した放射線を検出する放射線検出手段52が収納された筐体42と、筐体42の内部に設けられ、放射線検出手段52に電力を供給する電源20と、筐体42に形成され、持ち運び用の取っ手12が装着される接続部14と、接続部14に設けられ、取っ手12が装着されると電源20からの電力の供給を遮断する電源遮断手段16とを有している。【選択図】図1