The purpose of this study is to describe social interaction and relationship of an integrated play group in an elementary school and to analyze meaning of them. The research method is an ethnography, in which participant observation of activities in the play group, and unstructured interview, and reference document analysis were used. And the collected data were analyzed by using the qualitative data general analysis. As time passes, there was changed aspect of relationship of in the integrated play group. ‘Children playing separately’ were transformed into ‘Children playing together’. Not related to the flow of time, the topic were derived from specially interaction in the play group is ‘Children's strategies for playing together’. That strategies consist of ‘take caring, tolerance, help, change’. And the topic words of ‘The space for integration’, ‘The space for play’, ‘The space for relation’ were derived from the meaning of the integrated play group. Finally, based on these results, the integrated play group discussed the implications of the inclusive education.