The purpose of this study was to examine effects of self-efficacy and social support on job satisfaction of babysitters as child care support project workers. How to increase job satisfaction of these child care support project workers is also proposed. For the purpose of this study, questionnaires were distributed to 310 babysitters at childcare service providers in Sejong City, Korea. A total of 258 questionnaires were used for the final analysis. Collected data were analyzed using SPSS 29.0 statistical program through frequency analysis, descriptive statistical analysis, independent sample t-test, ANOVA, correlation analysis, and hierarchical regression analysis. It was found that the higher the preference for task difficulty in self-efficacy and the higher the family support, the more efforts they made to develop individual teaching methods. In social support (total), job satisfaction was higher among those who entered the institution through training course, received higher salary, and received higher support from seniors (person in charge in connection with service providers), colleague, and family. However, the lower the final education, the lower the job satisfaction. As for effects of job satisfaction sub-factors on interpersonal relationships, those who were older with higher sense of self-regulation, higher support from superiors, peers, and family seemed to have higher satisfaction with interpersonal relationship. Regarding overall job, those who had higher level of supports from superiors and peers with higher salary had more positive attitude toward the overall job. Those living in Dong who had higher education background were not satisfied with the job. Regarding salary and welfare benefits, the higher the level of salary and the more family support, the more satisfied they were. However, the higher the final level of education, the less satisfied they were. Difficulty was also expressed in the preference for task difficulty for self-efficacy. As for the development of individual teaching methods, it seemed that the more children they took care of, the more difficult it seemed to develop childcare teaching methods. This paper recognizes the importance of job satisfaction to improve the quality of public care services provided by babysitters, seeks ways to overcome difficulties through self-efficacy enhancement and social support, and tries to provide basic data for policies and practice methods that can increase job satisfaction.