The purpose of this study is to discuss and clarify what effective teachers' interaction are in order to develop children's germs of morality. It mainly focuses on interactions between teachers and children and examines effective teachers' interactions to develop children's germs of morality by recording episodes of children whose germs of morality seemed to be developed. This study clarified that four types of teachers' interactions were important: 1. teachers' interactions closing to changes of children’s minds, 2. teachers' interactions conveying the importance of what the children cannot directly see, 3. teachers' interactions receiving what children really think, 4. teachers' interactions recognizing the children facing what they think. In addition, the researcher considered that not only teachers' direct interactions with them but also "teachers' senses of values" would have a lot to do with developing children's germs of morality. In further research, the researcher clarifies teachers' roles which are important for raising children's germs of morality with wider perspectives.