In 2009, Japanese population aging rate reached 22.7_. There are growing populations of aged people. The number of elderly people with dementia has also increased. In Japan, half of the elderly people with dementia who need to be cared for live at home. However, the practical applications of home environment improvement for their family caregivers are not established. And, from our previous studies, we think it is important to link between caring and home environment. In this study, we define home environment improvement as a set of change living of elderly people at home. These range from small alterations of furnishings to large home modifications. This purpose of this study is to investigate the current status of home environment improvements for demented elderly. In addition, I would like to show concrete examples of home environment improvement. 1) Targets: The samples were 13 households with demented elderly. These samples were collected from three areas in Tokyo and Kanagawa. In a lot of cases, interviewees were family caregivers. Some cases, interviewees were family caregivers and demented elderly. 2) Approach: We used hearing investigation from February to March2009. The investigators were researchers, architects, and graduate students. Our survey items were follows: elderly people’s conditions, housing conditions, and the content of home environment improvements. We took pictures home environment improvement. 3) Analysis: We divided into “the dimensions of home environment improvement” based purpose of home environment improvements. The dimensions of home environment improvement were developed our previous research with questionnaire survey. These dimensions were composed of eight dimensions; safety &security, understandability & usability, support functional abilities, enjoy comfortableness & stimulation, continuity of the self, maintenance of health, alleviation of confusion, and alleviation caregiver’s burden. The majority of the 13 sample members were female (84.6%). The average age of the 13 elderly people were 86.2 years old. From 13 samples, we identified one hundred sixty three home environment improvements. Out of one hundred sixty three home environments, the most home environment were practiced space were private rooms of demented elderly people and living room by family caregivers. In bathroom and entrance, a lot of home environment were practiced. For example, we found weekly schedule to support understanding of time and place, hanging one’s favorite creation for having attachment to own house, and making the air-conditioner remote control more accessible than ever before. We compared this study with “age-specific environmental dimensions” developed in the U.S. “Age specific environmental dimensions” were composed of eight dimensions; safe- ty, orientations, functionality, stimulation, personal control, social interaction, continuity, change. They share certain similarities in that both include 5 dimensions; safety, orientations, functionality, stimulation, continuity. Our next goal is to propose a study of developed home environment improvement, combining the both purposes of caring and home improvement.