The castle town is an urban area built around a castle, and is generally constructed by city planning. The greater parts of existing cities are founded on the castle towns, and two thirds or more of prefectural capitals are founded on them. The purpose of this study is to consider the transition process of castle towns. As results the railway were introduced dose to the castle town, the commerdal center of the town moved from main street to the area around the railway station. The expansions of it ies were changed from the neighborhood of main road to the neighborhood of railway station. Industrial factories were constructed at the fringe of built-up areas. In and around the castles there were situated the prefectural office or army fadlities.
