Group homes are engaged in prevention of the elderly patients with dementia getting lost by posting signs identifying residents’ rooms and restrooms. In this research, I focus on these efforts and investigate whether the posting of signs provides hints for residents to find their position. As a result, it was found that getting lost occurs in patients with moderate dementia, and although they are initially able to walk in the direction of their intended destination, they are unable to understand detailed locations near the intended destination. It was found that posting signs had the effect of preventing getting lost.