The purpose of the study was to analyze the influence of homeroom teacher's transformational leadership on middle school student's self-efficacy. Based on related theory and previous research, independent variables in the study were student background variables(gender, grader, grade, homeroom teacher's gender, and homeroom teacher's teaching career) and homeroom teacher's transformational leadership, and dependent variable was middle school student's self-efficacy. 834 middle school students were included in the analysis, and the analysis was performed by descriptive statistics, t-test, one-way ANOVA, correlation, and multiple regression analysis using SPSSWIN. The main results were as the follows. First, among student background variables, there was statistically significant difference in homeroom teacher's transformational leadership by grader, homeroom teacher's gender, and homeroom teacher's teaching career. Second, there was statistically significant positive correlation between homeroom teacher's transformational leadership total and sub-scales and self-efficacy total and sub-scales except for confidence. Finally, after controlling student background variables, homeroom teacher's transformational leadership influenced statistically significantly middle school student's self-efficacy total and sub-scales(self-regulated efficacy and task difficulty). Some suggestions for the main results were discussed