An X-ray image analyzing system, including: an X-ray source for radiating an X-ray; an X-ray detector for detecting an X-ray image radiated onto an x-ray image detection surface, wherein phase contrast X-ray simple imaging is capable of being performed determining a trabecular bone index computing region, computing a trabecular bone index indicating a state of a trabecula from image data in the trabecular bone index computing region, determining a bone-flesh boundary index computing region by a second region determination method different from the first region determination method, and computing a bone-flesh boundary index indicating smoothness of a bone-flesh boundary from image data in the bone-flesh boundary index computing region.