In Japan, even if it is seen worldwide, it has a lot of earthquakes, and it is said that Japan is an earth-quake nation. Therefore, we must think about earthquakes in situation of our lives. And the thing from which we will suffer great damage by a big earthquake the near future is expected, for example, Nankai Trough massive earthquake. However, it is very difficult to take measures at the same time to the respective regions. In this study, the earthquake risk an infrastructure in all part regions possessed are focused, and the earthquake risk is expressed quantitatively by a risk curve. Moreover, it was revealed that urban area do not have same risk by comparing earthquake risk curve in all part regions.