The purpose this study is to discuss the reproduction of the social system based on a gateball club of senior men. For this I adopted structuration theory of Giddens. Also used a case study that is one of the qualitative research method, selected C club, B Gu, A Metropolitan. In the research environment, 12 people were used as contributors. I collected data by conducting extensive interviews with participant observation and text analysis. The results are as follows: First, there are two implicit rules in the senior gateball club. Those are to acquire the fellowship and to remain active membership. To acquire fellowship and maintain membership, one must complete the training, pay dues, join the branches and attend the monthly competition. These are categorized as normative rules. To be active as a member, they are playing gateball, making donations, enhancing their abilities, and keeping good relationships. Those are shown to be the analytical rules. Second, there are two implicit reasons why they are joining senior gateball; they want to be accepted by others and show that they are motivated to be active in the club. To be accepted by others, they show the authority of executive, age, motor skills and personalities. We categorized these as authoritarian volunteering. The motivates of their club activity are capital, support of their family, a place for rest and new relationships. These showed distribution resource. Third, the structuralization process of senior gateball club are normative rules to acquire and maintain fellowship, these analytic rules are to be active as a member and authority volunteer. The goals be to accepted by others, distribution resource and to show motivation for their club activity.　These interact with each other to show connection with the social system. Even though these show the connections between structure and the individual, they are not one way. They affect each other. In other words they have duplicity of structure. Fourth, we discussed the meaning of reproducing a social system by joining the senior gateball club, and by changing the meaning of older, collapsing the ecological age, promotion of social position and reforming the new senior culture. In conclusion, it was negative to be seen as older before whereas now there are changed in a new social structure. Individuals now have more positive attitude towards the new social structure.