This study is a descriptive research to investigate the effect of job stress on the organizational commitment of the nurses and to test the mediating effect of emotional leadership between job stress and organizational commitment. This study has significance in that there are not sufficient researches yet upon viewing emotional aspects and emotional leadership as playing mediating role though many have been engaged in leadership. A survey was conducted on 232 nurses in general hospitals located in Gangwon-do and data was collected from Nov 1st to Nov 23rd in 2014. Collected data were analyzed by SPSS Win 18.0 for frequency analysis, independent t-test, correlation analysis, ANOVA, factor analysis and regression analysis. Independent t-test on the general characteristics of the respondents showed that emotional leadership is not significantly different by sex, age, marital status, academic background, experience with job transfer and salary. By the analysis, it was turned out that emotional leadership has a statistically significant effect on organizational(R²= .061, F= 15.047,p=.000). Inhomogeneity(β=.218, p<.01) and role-ambiguity(β=-.380, p<.001), which are the sub-factors of job stress, were proved to have a statistically significant effect on organizational commitment while it didn’t turn out that role-conflict, which is also a sub-factors of job stress, have a statistically significant effect on organizational commitment. The regression equation(R²=.222, F=21.696, p<.001) that tests the mediating effect of emotional leadership between role-ambiguity(of job stress) and organizational commitment demonstrated that there is a significant relationship. Based on the findings above, conclusion can be made as follows. Because it was demonstrated that emotional leadership has an impact on job stress and organizational commitment, it is necessary to develop a program internally in a hospital and provide nurses with training, which help them exert their competence in emotional leadership.