Emergency Management is referred to as a field of Applied Management Science in the United States. There is no single integrated framework in Japan, like Emergency Management. This paper examines the Japanese disaster management regime from a perspective of organizational structure and design, using the U. S. Emergency Management framework. As a result, the paper reveals that it is required to create a line organization at any government level as well as to design machine organization at the field level. It is necessary to combine both organizations to strengthen the response capacity.