The main goal of this study was to investigate the factors influencing the life satisfaction of elderly individuals living alone. We analyzed the data obtained in 2016 through "Survey on Residents'Quality of Life in Gyeonggi Province", performing stepwise multiple regression on 824 cases. The results were as follows: First, age, income, and education had a significant impact on life satisfaction, while sex, marital status, and employment had no influence on life satisfaction. Second, as individual-level factors, self-rated health, exercise, and participation in religious activities and social associations had a significant and positive impact on life satisfaction. Third, the results showed that both helping others in neighborhood and trusting people in the neighborhood, between-person factors, positively influenced their subjective quality of life, but receiving help from the neighborhood did not significantly affect life satisfaction. Fourth, satisfaction with cultural facilities, one of the physical environmental factors, was associated with life satisfaction. These results suggest that multi-level factors influencing life satisfaction should be considered to enhance the quality of life of elderly individuals. In particular, they suggest that when planning measures, it is necessary to consider built-environments for the elderly.