Radiographic image capturing apparatus and heat dissipation method

A radiographic image capturing apparatus includes: a radiation detector in which a plurality of pixels for accumulating electric charges corresponding to emitted radiation are arranged; a control unit that controls the radiation detector; a radiation emission unit that emits radiation; a housing unit in which the radiation detector and the control unit are housed and which has a heat dissipation port and a radiation detection surface irradiated with the radiation emitted from the radiation emission unit; and a support unit that supports the radiation emission unit at a position facing the radiation detection surface and has a hollow portion forming a space continuing from an inside of the housing unit through the heat dissipation port.