Provided is a portable radiographic imaging apparatus capable of capturing moving images, and capable of improving the efficiency of heat radiation of electronic components to the outside of the housing. In the portable radiographic imaging device 1 configured by housing a sensor panel SP in a housing 40 formed by a front plate 41 and a back plate 42, the radiation detection element 7 is disposed on the back plate 42 side of the sensor panel SP. The electronic components 16 and 59 that are used to read out the electric charges generated in step S1 as the signal value D and generate heat when the signal value D is read out are disposed between the electronic components 16 and 59 and the back plate 42. The conductive member 61 is disposed, and the heat conductive member 61 is pressed by the back plate 42 and the electronic components 16 and 59, whereby the heat conductive member 61, the electronic components 16 and 59, and the heat conductive member 61 are The back plates 42 are disposed so as to be in close contact with each other.動画撮影を行うことが可能な可搬型放射線画像撮影装置において、電子部品の熱の筐体外への放熱効率を向上させることが可能な可搬型放射線画像撮影装置を提供する。 フロント板４１とバック板４２で形成される筐体４０内にセンサーパネルＳＰが収納されて構成される可搬型放射線画像撮影装置１において、センサーパネルＳＰのバック板４２側に、放射線検出素子７内で発生した電荷を信号値Ｄとして読み出すために用いられ信号値Ｄの読み出しの際に発熱する電子部品１６、５９が配設されており、電子部品１６、５９とバック板４２との間に熱伝導部材６１が配設されており、熱伝導部材６１は、バック板４２と電子部品１６、５９とで押圧されることで、熱伝導部材６１と電子部品１６、５９、および熱伝導部材６１とバック板４２がそれぞれ密着するように配設されている。
