The study aimed to examine how mother-teacher relationship impacts on child-teacher relationship and child's adaptation to childcare center. The subjects of this study were 191 children of four and five years old and their mothers and their 14 teachers in charge and three kinds of questionnaire was used as research tools. The results of the study are summarized as follows. the mothers perceived that they trust teachers and have coopertaive relation with them, but mothers feel they don't have sufficient conversation and sharing their educational values with the teachers. The teacjer-child realtionship tends to be positive and the children have no serious difficulties in childcare center. As for child-teacher relationship depending on mother's attributes and child‘s adjustment in childcare center, it showed no significant difference depending on mother's age or educational attainment, whereas it was shown that working mother's child had more conflict relationship with teacher than non-working mother's child. Second, although no significant correlation was not found between mother-teacher and child-teacher relationship and between mother-teacher and child's adjustment in childcare center in general, a significant correlation was shown between child-teacher relationship and child's adjustment in childcare center in general, the less close relationship and the more conflict or dependence between the child and teacher, the more possibly the child show difficulty in adjustment in the childcare center. Third, mother-teacher relationship and child-teacher relationship have an relative influence on the child's adjustment in childcare center.