The objective of this study is to examine relevant factors of the service level of aged care facilities. The sample used in this study consisted of 357 aged care facilities in Korea. Data were collected with self-administered questionnaire and 140 returned questionnaire were analyzed by SPSS Version 12.0. The major findings of the study are as follows: First, there was no significant mean difference in the service level by the facility characteristics, except the length of operation. Second, it was found that both administrative characteristics and employer characteristics were positively associated with the level of nursing and supportive services. Third, the study results revealed that the following three variables of employee education and training, community networks, and employer`s philosophy and management principles had significant positive effects on the level of nursing services. Meanwhile, the following two variables of employee education and training, and community networks had significant positive effects on the level of supportive services. In conclusion, in order to improve their service level, the managers of aged care facilities in Korea should make efforts to provide more employee education and training, establish networks with the community stakeholders, for example, local clinics and hospitals. It is also recommended for the government to make a policy inducing more qualified private investors to enter the aged care market, as well as to strengthen the qualification of the managers of the public aged care facilities.