The purpose of this study is to find out the effects of family functions and social supports on happiness which a child perceives. These findings would be a key figures of the child`s quality of life. This study were used 222 questionnaires which were colllected from elementary school students. The data was analyzed by frequency, percentage, average and standard deviation, t-test and Anova, and used Duncan`s Multiple Range Test for the later verification. The results were as follows: First, socio-demographic variations such as sex, subjective health condition, subjective academic achievement, subjective economic level, residence, family pattern showed a significant difference in family functions. Second, social supports showed significant difference by socio-demography in gender, residence, patterns of family and its subjective health & economic conditions, and academic achievement. Child thought as social supports sources more their family and friends than teachers. Therefore, child of age 11 through 13 needs family and friends supports more importantly. Third, according to the result of the analysis of the effects of family functions and social supports on happiness of children, it is shown that social supports has more effects on happiness than family functions.