The wood frames which consist of engineered wood are combined tightly and they are arranged at intervals of 45cm to 1m. The wood frames which is covered by the plywood make "semi-monocoque structure" similar to aircraft or ship. By changing the type of sill, the building can adopt to the various ground situation. The width of the space will be about 6m without columns. The structure is stable yet simple, and thus you can construct the building in short period with reasonable cost. Because it is a solid structure, you can also carry it by a truck. A 2-storied house or a 3-storied house can be built using a unique box structure as well.