The purpose of this study is to analyze the relationship between self-efficacy of secondary school teachers, who also serve schools as administrators, and their job satisfaction in their administration work. The size of the teacher sample was 100 from all over the country, and the teachers were answered to both a self-efficacy and an administrative job satisfaction questionnaire. The result of the study reveals that: ① Teachers' job satisfactions in their administration work were positively related with their self-efficacy, and both self-confidence and self-regulatory efficacy factors in the self-efficacy were significant in their relation to their job satisfaction, ② Self-efficacy affected teachers' job satisfactions in their administration work, and self-confidence was one of the strongest factors to estimate teachers' job satisfactions in their administration work, ③ Teachers' job satisfactions in their administration work were not significantly related to individual factors such as school locations, school districts, or administrative positions, ④ Teachers who were satisfied with their administration work were more likely to be satisfied with their teaching work, and evaluated their own administrative work more highly.