This paper aimed to obtaining the knowledge of the proper standard formulation of group size and area scale based on it and understand facility management of after-school day-care center, we conducted a questionnaire survey on after-school day-care center based in Tokyo.Analysis of the survey results, it was to grasp facility management such as complexed facility, target children, area and group size.The difference was seen ideal sizes and environment such as a dynamic play and number of nursery space by another complexed facilities and target children.