The 1993 southwest-off Hokkaido earthquake hit okushiri island severely. The number of casualties was 165. Okushiri town had faced population decreasing and aging issues before the disaster. After the disaster, okushiri town had a lot of aids, especially from inside of Japan. The Japan had a very good economy at that time, so the situations enabled them to have such huge aids. Even though the large economic assistance, the town’s demographic tendency before the disaster was facilitated.Total population is from 4,604(1990) to 2,662(2015), an aging proportion, over 65, is from 15.6%(1990) to 38.6%(2015).