Abstract
In Nagoya metropolitan area, there are no relations with the distribution of a population increase or decrease areas and the urban structure. The distribution of both areas is like the mosaic. In the same way, it is the mosaic even with residential area in Yokkaichi City. The population increases in a favorble residential area within a vacant land by the gradual development. On the zero population growth, if population increases in a favorble area, population decreases on the other side. It is thought it is a reason that the distribution of a population increase or decrease area is the mosaic.