Companies are using IT outsourcing to efficiently use their core competencies. However, the lack of security awareness of IT outsourcing developers and inadequate security management of ordering companies are suggested as one of the causes of security incidents. Therefore, this study examines how the fairness of security management affects the willingness to comply with security targeting IT outsourced developers. As a result of conducting an empirical analysis based on 103 samples, it was analyzed that procedural fairness in the external site and interaction fairness in the internal site were important antecedents. This means that security procedures are clearly set at the site, and within the site, the willingness to comply with security can be improved when communication between employees is active. The results of this study have academic significance in that the organizational fairness theory is applied to the security field and presented as a new security theory, and practical implications are in that it suggests the direction of security management for outsourced developers.