The purpose of this study was to analyze about the effects of mother's attachment to toddler, parenting stress, and playfulness on her parenting competence. The subjects were 351 mothers with toddlers 18 to 36 months old in the cities of I and Y in Gyeonggi Province. Data were collected by questionnaires. Descriptive statistics, correlation analysis and multiple regression analysis were conducted to examine research questions. The findings of this study can be summarized as follows. First, significant positive correlations were found among mother’s parenting competence and attachment to toddler, playfulness. And significant negative correlations were found between mother’s parenting competence and their parenting stress. Second, mother's attachment to toddler, parenting stress, and playfulness were predicting variables for their parenting competence. In particular, mother's attachment to toddler was the most influential variation among mother's attachment to toddler, their parenting stress, and playfulness.