The purpose of this study is to compare the characteristics of the demented elderly and normal elderly over 65 staying at home in Seoul. Here, the demented elderly are defined as the aged who score under 20 on the MMSE-K testing. The subjects were 15.104 elders in home. The method is a cross-sectional study home visiting survey with questionnaires. Data analyses were conducted by using frequency, percentage, t-test and ANOVA procedures. Results are as follows: First, general characteristics such as sex, age, marriage, education, physical health, and family characteristics such as economic level and single living showed a significant variance between demented elderly and normal elderly. Second, the demented elderly showed a significantly high point of AD and IADL. Third, in contrast with normal agents, the dementia showed a high need for assistance from the care giver but followed the same pattern. In conclusion, the above findings suggested that a social support system should be developed for the demented elderly and care givers in the home.