The purpose of this study is to investigate the impact of IT components of e-CRM on customer response performances in e-CRM. To this end, we classified IT components of e-CRM into the ones for customer management and the ones for customer analysis on the basis of previous studies. Also, we identified variables for customer response performances and conducted empirical analysis. The main results of this study are as following. First, this study derives the IT components of e-CRM for customer management and customer analysis respectively by reviewing the previous studies. Furthermore, this study defines business performance variables as customer response performances. Secondly, the hypotheses concerning the correlations between the use of the IT components of e-CRM for customer management and customer analysis and customer response performance are partly accepted, which shows that the use of particular IT components has significant influence on customer response performance. The findings of this study can contribute to expanding the theoretical background in the area of e-CRM adoption and development and be helpful to practical implementation of e-CRM systems in business organizations.