This study investigated the antecedents and outcomes of 4 components of organizational commitment. Data for this research came from 260 non-expert fulltime workers in Japan. As antecedents, Positive human relationships in the workplace predicted greater internalization and attachment to the organization, while positive relationships with coworkers were negatively related to the continuance component. As outcomes, pro-organizational behaviors were facilitated by internalization, but not by attachment, and attendance at internal events was reduced by the continuance component. Implications for future research are discussed.