A radiographic image capturing apparatus has a mobile cart unit, a radiation source device detachably attached to the cart unit and including a radiation source, a detector device detachably attached to the cart unit and including a radiation detector, a determiner for determining whether or not a present position of the cart unit is in a predesignated zone, and an electric power supply activator enabling supply of electric power at least between the radiation source device and the detector device, if the determiner judges that the present position is in the predesignated zone.
