The aim of this study was to determine the relation among anxiety and family burden in primary first-degree relative caregivers of outpatients with mental disorders in Turkey. Data were collected with patients' primary first-degree relative caregivers via the Information Form, Beck Anxiety Inventory (BAI), and Perceived Family Burden Scale (PFBS). In all, 481 caregivers (325 women and 156 men) participated in this study. Based on this study's results, primary caregivers of patients with mental disorders had a moderate level anxiety, and as anxiety increased, family burden also increased. Those results suggest that mental health nurses should plan interventions not only for patients, but also for their family member or their caregivers to decrease anxiety level.