Background: Having a patient with borderline personality disorder (BPD) in the family is a complicated and stressful experience. The caregivers’ experiences and the problems they have in care of patient with BPD have remained unknown. The aim of this research was to explore the experiences of the caregivers while living with BPD patients in Iran. Methods: This interpretive phenomenological research was performed on 10 caregivers of patients with BPD at Ibn-sina Hospital in Mashhad, Iran, in 2019. Purposeful sampling was used for sampling.