Personality disorders (PD) include biases of cognition about the self or others in the general diagnostic criteria. Although the relationships between PDs and self-esteem have been clarified, the relationships of PD traits and evaluation affect about others have not been studied. This study examined relationships of PD traits and assumed competence in 304 undergraduates and graduate students. The results showed that individuals with the assumed type of competence had higher scores for borderline and obsessive-compulsive PD traits than other PD traits. The results suggest that maladaptive personality traits involve not only negative self-cognitions but also negative cognitions about others.