1. A radiation image capturing apparatus comprising: a radiation source for applying a radiation to a subject; a radiation image information detector for detecting a radiation from said radiation source which has passed through the subject to capture radiation image information of said subject; a radiation dose detector for detecting a radiation dose which has passed through a region including an area of interest of said subject; means for identifying a region in which a detected value detected from the region including the area of interest by said radiation image information detector is smaller than a predetermined threshold value, as the area of interest; and correcting means for correcting the radiation dose detected by said radiation dose detector based on a detection corrective value calculated from detected values from an entire region including said area of interest and detected values from said area of interest; wherein an exposure control condition for the radiation to be emitted from said radiation source is determined based on the corrected radiation dose.