A radiographic image imaging device and a radiographic image imaging method are provided. The device includes: an acquisition component that acquires battery remaining power amount information representing an amount of power remaining in a battery, which is incorporated in a portable radiographic image imaging device and supplies power to the portable radiographic image imaging device, the portable radiographic image imaging device detecting radiation irradiated at a subject of imaging and generating a radiographic image; a calculation component that calculates a possible standby duration of the portable radiographic image imaging device on the basis of the battery remaining power amount information acquired by the acquisition component and a number of images of the portable radiographic image imaging device; and a display component that displays the number of images and the possible standby duration.