The purpose of this study was to examine the processes of development and change of attachment between an infant and his nursery teachers in detail by qualitative data. The subject of the study was an infant who had developed insecure attachment among his initial attachment figure. He was observed for 9 months (July-March). In the first term (July-August), he showed attachment behavior to several teachers. The interactions between the infant and each teacher were analyzed. There were several interactions by each teacher, and the responses of the infant to each teacher were also different.