Historically and up to the present day, many fires have been generated by earthquake disasters. Although such fires have all occurred under widely different circumstances, for example, seasons, times, places, building types, and cooking and heating apparatus including the types of energy sources, it is important to analyze the mechanism by which the fires break out after earthquakes by comparing recent cases with past disasters. In this paper, we analyze the mechanism of the outbreak of fire after the 1995 Hyogo-ken Nambu Earthquake, and discuss the transition of this mechanism in comparison with past cases.