Abstract
In this study, the cases of flood disaster mitigation by building regulation and guidance in urbanized area were investigated. The purpose of this study is to consider the effect and problem of each case, and to clarify the function of each case in flood countermeasure and the citizen’s role. As a result of the investigation, it was found that the effects of existing institute and method are limited for improving flood disaster mitigation in urbanized area in preparation for flood risk rising by the influence of climate change. New institute and method should be considered.