Since an X-ray image shows a vertical seam on the side of main body, it is assumed that the statue, which was originally made of a single tree, was split into two at the back and belly and then hollowed.
X線写真によれば、本体側面に縦の矧ぎ目があり、一木で制作した像をいったん前後に割り放し、内刳りを施したものと見られる。