The purpose of this paper is to examine the social support of neighborhood adults and children’s life satisfaction. In addition, this study examines whether the effects of nonparental adults on children are contingent on the stage of children’s schooling. This survey was executed in Nagoya city in March 2008, the response rate being 33.3%. The sample for this analysis comprised 158 students in Grades 5-6 in primary school and in Grades 1-2 in junior high school and their mothers who are married and live with their husbands (N＝316). Multivariate analysis was conducted to examine 1) whether the social support of nonparental adults in the neighborhood for children is positively associated with their life satisfaction, 2) whether the association between social support of nonparental adults and children’s life satisfaction in the case of junior high school students is significantly stronger than that in primary school students. The results of the analysis suggested that nonparental adults’ support for children was positively associated with their life satisfaction. Moreover these effects were more marked for junior high school students compared with primary school students. These findings indicated that relationships between neighborhood nonparental adults and children were significant for the children’s life satisfaction and that the older the children’s age, the stronger the effect of social support of nonparental adults even after the affinity of parents, friends and teachers had been taken into account. In general, family relationships are thought to be critical for children’s social development. But this study shows that intergenerational relationships outside the family are also important for children’s outcomes.