This research is based on a phenomenon that occurs in State Detention Centers in Indonesia. It attempts to test the relation among proactive personality (PP), proactive work behavior (PWB), job satisfaction (JS) and role breadth self-efficacy (RBSE) variables. With a quantitative approach using AMOS, this study took data from 455 respondents from Detention Centers in Indonesia. The results show that PP, JS and RBSE have direct effect on PWB. Further findings will be discussed. The results are expected to increase the understanding of PWB and can be the basis for the human resource management team to decide better approach to build PWB in the organization and eventually implement appropriate policy.