The purpose of this study was to examine the effects of private security guards' shared leadership (directive, transactional, transformative, delegated) on knowledge sharing and resident orientation for private security guards working in private security companies in domestic regions (Gyeongnam, Busan Ulsan). The results of this study are that, first, knowledge sharing increases when private security guards have high shared leadership (directive, transactional, transformative, and delegating). Second, private security guards with high knowledge sharing have more resident-oriented activities toward residents. Third, if the private security guards' shared leadership (directive, transactional, transformative, and delegating) is high, resident orientation is increased. Fourth, when the shared leadership (directive, transactional, transformative, and delegating) of private security guards increases, knowledge sharing increases and thus residents' orientation increases. Fifth, looking at the mediating effect, among the sub-factors (directive, transactional, transformational, and delegating) of shared leadership of private security guards, there is a partial mediating effect of transactional shared leadership and transformative shared leadership → knowledge sharing → resident orientation confirmed to be caused by This recognized the need for a human resource plan for private security guards in Korea.