OBJECTIVE: To evaluate the relationship between depression and cognitive-behavioral characteristics of caregivers using social problem solving inventory (SPSI), social support or conflict scale (SSS or SCS) and somatic symptoms (SS). METHOD: Fifty five couples of brain-injured patients and caregivers participated in this study. We conducted a questionnaire survey of caregivers with Beck depression index (BDI), SPSI, SSS, SCS and SS for cognitive-behavioral characteristics. And also we studied demographic factors of patients and caregivers, clinical features of brain-injured patients, care- giving duration and time per day through interview and review of medical records. The statistical analyses were performed by independent t-test, one-way ANOVA, Pearson correlation test and linear regression analysis-stepwise method. RESULTS: BDI of the caregivers showed a negative correlation with SPSI, SSS, patients' MMSE and caregivers' education level, also a positive correlation with SCS, SS and patients' GDS (p<0.05). And married caregivers showed more depressive mood (p<0.05). Of these factors, the most influencing factors on BDI were GDS and SCS through linear regression analysis (p<0.01). CONCLUSION: MMSE, GDS and education level as cognitive- mental factors rather than physical and economic strain had a statistical correlation with depression of caregivers. Especially, SPSI, SSS and SCS as cognitive-behavioral characteristics should be considered on evaluation of depression of caregivers and will be helpful for successful rehabilitation for patients and caregivers.