The present study verified that organizational companionship reduces the effect of task conflict on relationship conflict, which leads to positive effect on team effectiveness indicators - teamwork and team performance. Data were collected from 304 employees using survey questionnaires. The result indicated that relationship conflict mediated the relationship between task conflict and teamwork. Also, the results showed that a moderated mediation effect of organizational companionship was significant. Specifically, the higher organizational companionship, the less mediation effect of relationship conflict. Results of structural equation modeling signified that the moderated mediation effect leads to positive effect on team performance. Lastly, implications and limitations of the results are discussed.