1. A radiation image capturing system comprising: a plurality of image capturing apparatuses, each image capturing apparatus including at least an image capturing base and a radiation detecting apparatus for detecting a radiation having passed through a subject present on the image capturing base and for acquiring radiation image information of the subject; an image capturing position information holding unit for holding image capturing position information with respect to the subject of the radiation detecting apparatus, disposed in the image capturing base; an image capturing position information acquiring unit for acquiring the image capturing position information from the image capturing position information holding unit; and a magnification adjuster for adjusting an image magnification of the radiation image information acquired by the radiation detecting apparatus based on the acquired image capturing position information, wherein radiation images acquired by each image capturing apparatus are processed to have the same image magnification among the image capturing apparatuses.