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; and a condition storing section that stores thereon an inappropriate condition, wherein the image detecting information storing section stores a number of hits indicating a number of times at which the image detecting condition designated by the image detecting information designating section is judged to fall within the inappropriate condition stored on the condition storing section, and wherein as the number of hits stored on the image detecting information storing section increases, when the image detecting condition designated by the image detecting information designating section falls within a condition which indicates an accordingly greater range than the inappropriate condition, the warning section issues warning to the user.