Facing to the beginning of the 21st century, the situation involving the city in Japan is changing drastically. It is necessary to reorganize the central city area where was not considered and planned as area which bears the core of the city in urbanized society. This paper focuses on four subjects on reorganization of the central city area in urbanized society; necessity of reorganization of the central city area as measure of the city planning, existence of many theme which relate various fields broadly and across boundaries, systematization of related plans in a local government, systematization of related organs.
