Abstract: The object of the present invention is to provide high quality of an unit body for forming a foundation of a house, the foundation forming operation of which can be carried out within a short period without being disturbed by the climates or the temperatures, as well as with extremely precision even by highly limited number of workers who do not have high level of experienced technology, and further, the present invention can also provide the unit body, which can reduce the construction costs including the transporting costs as well as can provide a highly qualified foundation of a house having anti-earth quake characteristic and high durability thereof.