PURPOSE: To support a shaft from a lower side module by using the modules having a structural strength sufficient to support an upper side module.

CONSTITUTION: The modules 12 in a lift shaft furnished with the piling of individual self-supporting prefabricated shaft modules 12 and 13 have a structural strength sufficient to support the upper side module 13. As a result, the shaft can be supported from the lower side module 12. On the upper side and/or the lower side modules 12 and 13, a means to regulate the interval between the parts provided by placing an interval in the vertical direction of the modules in order to include a fluid material is provided. In this clearance, a structural resin of a liquid or a plastic form which forms a resin-made solid bed to support the parts provided by placing an interval in the vertical direction of the modules, when it is coagulated, is filled.