In most cases, private security companies are operated by large companies in South Korea, which leads to competition among small companies rather than the private security companies of large companies. And it is true that a vicious circle has been repeated in which inefficient work system and high turnover due to the minimum-level wage, limited opportunities for promotion, and insufficient education & training result in the lack of expertise in most private security guards. As a result, the importance of private security guards' vocational ethics as well as their expertise is perceived more than ever. This study investigated the effects of private security guards' vocational ethics on their job attitudes and job involvement. A questionnaire survey using the self-administration method was carried out, with private security guards belonging to private security companies in Daegu and Gyeongsangbuk-do as the subjects. And data from a total of 221 subjects were used in the final analysis, using cluster sampling among non-probability sampling. As for the data analysis of this study, frequency analysis, factor analysis, reliability analysis, cross tabulation analysis, t-test, F-test, correlation analysis, and multiple linear regression analysis were carried out, using the SPSS WIN 18.0 program. As a result, the following findings were derived. First, in terms of socio-demographic characteristics of the private security guards, the subjects showed differences in vocational ethics according to marital status and turnover intention; showed differences in morality according to income and business area; and showed differences in diligence according to turnover experience. They showed differences in job attitude according income and turnover experience; and showed differences in job satisfaction according to income. They showed differences in identification according to income, continuous service year, and turnover experience; showed differences in organizational commitment according to income and turnover experience; and showed differences in work attitude according to turnover experience. They showed differences in job involvement according to income and turnover experience; showed differences in identity according to income and turnover experience; and showed statistically significant differences in consciousness of participation according to income and turnover experience. Second, it was found that there were high positive(+) correlations among private security guard's vocational ethics, job attitude and job involvement. Vocational ethics showed a high correlation with job attitude, and job attitude and job involvement showed a high correlation with each other. Third, it was found that private security guard's morality and diligence had significant effects on job satisfaction, identification, organizational commitment, and work attitude. And morality and diligence were found to have significant effects on consciousness of participation and identity. Fourth, it was found that private security guard's job satisfaction, identification, organizational commitment, and work attitude had significant effects on job involvement, and that work attitude, job satisfaction, and organizational commitment had significant effects on consciousness of participation.