The purpose of this study was to examine the path model of mothers` optimism, parenting behaviors and a child`s optimism and the effects on their child`s subjective well-being. The subjects of this study consisted of 331 pairs of mothers and their children from 5th and 6th elementary school students in Seoul. Data were gathered via four questionnaires on mothers` optimism reported by mothers and their parenting behaviors, child optimism, and child subjective well-being as reported by the children. Data were analysed by Structural Equation Model using AMOS 19.0. The results indicated the following, the hypothesized model yielded an acceptable model fit and most of the hypothesized path coefficients were found to be significant. Specifically, mothers` optimism and parenting behaviors influence their children`s subjective well-being indirectly through children`s optimism. It is concluded that the more optimistic the mothers, the more likely the children themselves will share that optimism and in turn, they will also have higher levels of subjective well-being.