This research aims at examining the relationships between mother-toddler interaction and its related variables. A total of 49 toddlers and their mothers were participated and observed in the child lab during free play. The main results of this study are as follows. First, among the mother-toddler interaction, ``involvement`` was frequently used in comparison with the ``rejection`` was the hardly used in their interaction. Second, the mothers`` sensitivity, parenting stress, and the mother-toddler interaction had no significant difference by the mothers`` job status or gender of toddlers. However, their parenting stress was lower in working mothers or mothers who have girls, Third, mother-toddler interaction was significantly correlated with the mothers`` sensitivity, parenting stress, parenting style, and the temperament of toddlers, On the basis of this results, the implication related to the variables influencing mother-toddler interaction was discussed.