Abstract
The rapid growth of the Japanese economy has been impacting on the basic city infrastructure including highways, freeways, railroads, subways, houses, public parks, and so on.
However, the construction speed has been slowing down because of the serious negative barriers such as the big increase of the cost, the protection of citizens against the construction and limited land room. Underground space was worthy of note to create room for infrastructure, but the shallow underground space of public areas had already been used for them, A new law was proposed to utilize the deep underground space for the infrastructure after a lot of technical research and a creation of a new concept for the law. This law should have the possibility to accelerate the rapid and effective construction and enhance the future infrastructure base.
