The purpose of this study is to identify the differences of stress according to general characteristics and find stress related factors to reduce stress level of family caregivers for demented elderly. Subjects were 72 family caregivers for demented elderly in Seoul and Gyunggi province. Stress were analyzed by t-test, ANOVA, Scheffe test and multiple regression according to gender, age, residence, marital status, number of family members, number of children, religion, education level, occupation, monthly income, relation with the demented elderly, caring years of the demented elderly and symptom of family caregivers for demented elderly. The results were as follows. First, the stress of family caregivers for demented elderly were significantly high in number of family members who live alone with demented elderly, education level with elementary school or below, monthly income with below 2,000,000 won, and the ones who have symptom by taking care of demented elderly. Second, stress related factors of family caregivers for the demented elderly were women, age between 60-69, number of family members that live alone with demented elderly, education level with elementary school or below, monthly income with between 1,000,000 - below 2,990,000 won, daughter-in-law and son of demented elderly. The family who live alone with demented elderly, family with low education level and low monthly income were important variables of family caregivers' stress for the demented elderly. Therefore it is assumed that support for family who living alone with demented elderly, family with low education level and low monthly income can reduce the stress of family caregivers for the demented elderly.