1. A radiation image detecting system comprising: an image detecting information storing section that stores thereon an image detecting condition under which a radiation image which is judged by a reader of the radiation image to be inappropriate is detected; an image detecting information designating section that, before a radiation image of an examined subject is detected, designates an image detecting condition under which the radiation image of the examined subject is to be detected; and a warning section that issues warning to a user when the image detecting condition designated by the image detecting information designating section falls within a predetermined range including the image detecting condition stored on the image detecting information storing section.