The purpose of this study was to identify the influences which were child care center infant teacher's coaching competency, director management competency, institutional resources, and parent expectation and participation that have on infant-teacher relationships. The subjects in this study were 379 infant teachers working in child care centers across the country. A director management competency questionnaire, institutional resources questionnaire, parent expectation and participation questionnaire, infant-teacher relationships questionnaire, and coaching competency questionnaire were used for this study. For the research analysis, frequency, Cronbach's α coefficient, and Pearson's correlation were calculated and regression analysis were conducted. The results are as follows. Firstly, the influence of director management competency on infant-teacher relationships is completely mediated through infant teacher's coaching competency. Secondly, the influence of institutional resources on infant-teacher relationships is completely mediated through infant teacher's coaching competency. Thirdly, the influence of parent expectation and participation on infant-teacher relationships is completely mediated through infant teacher's coaching competency.