Section II indicated that (a) wood is extremely unstable materials for sculpture and (b) the inside boring technique is very effective in the prevention of splitting wood, making the best condition of materials, and finishing the beautiful sculpture. Section III considered the period characteristics of the inside boring structure and its expressive effectiveness in the change of the Buddha sculpture techniques, and indicated effectiveness of the inside boring technique. Section IV checked and considered the inside boring structure of the Jikokuten and the Zochouten Buddhas(produced around the 10th century) in the Konin Temple from a wooden sculptor's point of view. Section V investigated the significance of the inside boring technique in th...