This study investigated the relationships between parental marital conflict, attachment to parents and peer relationships. The mediating role of attachment to parents was also explored in the relationship between parental marital conflict and peer relationships. Two hundred eighty four 8th graders participated in this study. The participants answered questionnaires regarding parental marital conflict, attachment to parents, qualify of their friendship, and attachment to peers. The main results of the study are as follows: First, adolescents who perceived a higher level of parental marital conflict reported less positive feelings and more negative feelings toward their friends. They also reported lower peer attachment, and tended to perceive their friendship functions negative. Second, adolescents who showed stronger attachment to their parents reported more positive feelings and less negative feelings toward their friends. They reported higher peer attachment, and perceived friendship functions positively. Third, adolescents who perceived a higher level of parental marital conflict showed weaker attachment to their parents. Finally, attachment to fathers and mothers mediated the association between parental marital conflict and peer relationships. In other words, parental marital conflict had an indirect effect on peer relationships. The results suggest that attachment to fathers and mothers that resulted from parental marital conflict played an important role in determining peer relationships among adolescents, rather than the existence of the parental marital conflict itself.