Objective: The purpose of this study was to develop assessment indicators and to verify the validity and reliability of the developed assessment indicators. Methods: A Delphi survey, focus group interviews, and content verification were conducted in order for experts to develop an evaluation index of the strengths of the day care center. A main survey was conducted on 438 daycare center principals and teachers to test their item quality, validity and reliability. Results: The final assessment indicators consisted of three areas, seven assessment criteria, 19 evaluation factors, 41 assessment items and a five-point rubric rating scale. As for the common strengths indicators, there were three assessment areas, five assessment criteria, 12 assessment elements and 22 assessment items. In regard to the selective strengths indicators, there were 3 assessment areas, 5 assessment criteria, 12 assessment elements and 16 assessment items. Conclusion/Implications: The efforts to confirm the strengths of daycare centers are expected to facilitate the identity building of the daycare center itself and for its organizational members to make a contribution to the qualitative improvement of childcare.