Borderline personality disorder (BPD) is often manifested by maladaptive behaviours such as self-injury. The interpersonal style characteristic of BPD makes it difficult to maintain stable therapeutic relationships, with the patient often discontinuing treatment. Although dialectical behavior therapy (DBT) has been reported to benefit patients with BPD, reports in Asian countries have been few. We herein describe a 22-year-old female with BPD and a history of attempted suicide and self-injury who underwent DBT at our hospital. Methods: Our 6-month DBT consists of 4 parts: weekly psychotherapy by a psychiatrist, weekly skills training by a clinical psychologist and nurse, emergency consultations, and supervision/consultation meetings. Individual psychotherapy and skills training sessions, respectively, were conducted for this patient 24 times. Results: After completing DBT, the number of self-injuries and frequency of suicidal ideation in our patient decreased. Conclusion: Although more costly than standard treatment for BPD, a trial of DBT might be worthwhile in Japanese patients.