One of the typical damage in gymnasiums due to the 2011 Tohoku earthquake was failure at connection between RC frame and steel roof. In order to prevent the damage of connection between the RC frame and the steel roof, it is necessary to conduct experimental study which simulates the stress condition of connection part under earthquake, and to clarify the relation between the detail and the structural performance of the connection. Moreover, it is necessary to clarify behavior of the RC-frame and the steel frame roof under earthquake. As the start of research, cyclic loading tests on a connection between the RC frame and the steel roof were conducted. In this paper, the background of this research, parameters of specimens, the experimental method, and the outline of experimental results were described.