More than a year has passed since COVID-19 was classifi ed as a class 5 infectious disease in Japan. Howevere, in elderly inpatient facilities, where residents are at high risk of developing severe symptoms, there is still a strong need to prevent mass infections. Therefore, the purpose of this study is to obtain knowledge that will lead to the prevention of the spread of COVID-19. I first clarify occurrence of COVID-19 cases in elderly inpatient facilities, and then consider the spread of positive cases from a spatial perspective.