A radiography image photographing device includes: a sensor panel in which a plurality of radiation detection elements is arrayed two-dimensionally； a housing that houses the sensor panel； a detector that detects triaxial acceleration applied to the housing； an integrator that integrates a temporal change of acceleration in each axis which acceleration is detected by the detector； a normalization processor that normalizes an integration value of the acceleration in each axis which value is by the integrator； and a determiner that classifies the numeric value of each axis, which value is normalized by the normalization processor, by a first threshold and determines an impact part on the housing on the basis of a result of the classification for each axis.
