The following are the results of two investigations in 1981, 1994 about residential mobility in Nagoya. (1)The residential mobility of families with elderly persons(especially, those comprising only elderly members 65 years old and over) has increased. The ratio of housing demand by residential mobility is about 47%, and has also increased recently. (2)Their residential mobility are classified into ten types. One of them, the small families (one-person households, husband-and-wife households) with elderly people may be defined as unstable in terms of residential life after moving. (3)The main reasons of their residential mobility are the dilapidation of their residences and the desire to live near their separated families. (4)The degree of living conditions has deteriorated by residential mobility. (5)The reasons of residential mobility or the living conditions after moving are varied for ten types.