The purpose of this study was to investigate the relationship on the ethical sensitivity and the consciousness of the vocational ethics from prospective sports instructors. 178 prospective sports instructors, 97 instructors for the life sport and 81 instructors for youth sports, participating in trial process in 2017 held by K university have been participated and analyzed. For completion of this study, the questionnaires for the ethical sensitivity including locus of control and Machiavellism and the consciousness of the vocational ethics have been used. The results are followings. First, there was significantly difference in gender and teaching career on the ethical sensitivity from 178 prospective sports instructors. Second, there was no significantly difference in locus of control and Machiavellism on the ethical sensitivity from 178 prospective sports instructors. Third, the ethical sensitivity had an effect on the consciousness of the vocational ethics. Lastly, locus of control from 178 prospective sports instructors did not have an effect on the consciousness of the vocational ethics whereas Machiavellism had an effect on the consciousness of the vocational ethics.