Oral history is one of the major research methods in both humanities and social sciences such as anthropology, history, and sociology. The characteristics have been discussed, and methodology has been accumulated over decades. This research note tries to grasp major research topic and research projects in oral history and tries to figure out what kind of research projects have been regarded as "oral history". In contrast to the previous literatures on oral history, this note does not look at methodological discussion but at actual research projects and articles by region. After grasping overall conditions of oral history research past around 50 years, I analyze rough trends according to survey population and research intention.