Traditionally, the construction of public facilities has been carried out by the government, with no thought given to the involvement of citizens in this process. As a result, the relationship between citizens and the government through public spaces has become a separate relationship of complaints and complaint handling. Public spaces should essentially be a third place for citizens, and to achieve this, it is necessary to build a partnership between citizens and the government. In this study, we focus on Kisela Kawanishi Seseragi Park, where consistent citizen participation was introduced from the design stage to construction and post-completion, with the aim of fostering a sense of attachment to the park among the citizens. The study investigated changes in the awareness of participating citizens, and expressed the view that citizens participation would foster an attachment to public spaces.