The purpose of this study was to clarify the characteristics of attachment styles in Japanese university students. Participating were 104 university students ranging in age from 18 to 26 years. Subjects completed the Experiences in Close Relationships (ECR) Scale, modified to include relationships in addition to romantic partners, and the Adult Attachment Scale (AAS). The findings suggested that students exhibited the same attachment styles in their most intimate relationship as they exhibited to people in general. On the ECR Scale, the preoccupied attachment style was not discriminated from the secure style. In comparison with the AAS, the preoccupied style on the ECR was not discriminated from the secure style on the AAS. Students showing the preoccupied attachment style on the ECR were securely attached as measured by the AAS. The incapability of discrimination between the preoccupied and the secure attachment style was partly due to the attachment style prototype based on behavioral patterns in American samples. (KB)