The main purpose of this paper is to discuss social risks related to aging populations, focusing on family and work for eldelry people in contemporary Japan. I mainly examine economic inequality measured by mean log deviation and the poverty rate as concrete phenomenon to show social risk. The data which I analyze is the Comprehensive Survey of Peoples Living Condition in 1986, 1995, and 2004, conducted by the Ministry of Health, Labor, and Welfare of Japan. There are two major findings of this paper. First, I found that the overall economic inequality among the elderly aged 65 and over has declined mainly because of the decline in the number of those who work and the difference in economic well-being between household types. In particula...