There is a lack of studies on mothers' and fathers' experiences of Health-Related Quality of Life (HRQOL) associated with caregiving of adult children suffering from mental disorder. A cross-sectional study was therefore carried out with 108 mothers and 43 fathers. Data were collected by means of the Short Form Health Survey (SF-36), the Hospital Anxiety and Depression Scale (HADS), the Family Involvement and Alienation Questionnaire (FIAQ) and the Burden Assessment Scale (BAS). Mothers' HRQOL was affected more than fathers' and lower compared to Swedish age related norms. HRQOL was predominantly related to ratings on HADS and BAS.