This article is about John Rawls's idea of public reason. The notion of public reason is one of the core elements in Rawls's political liberalism. As a matter of fact, the political character be later Rawls's theory can be resealed in terms of the very concept of public reason as well as its function and role in Rawls's political liberalism. According to Rawls, public reason is the reason of citizens, of those who sharing the status of equal citizenship. Therefore, coercive norms in a liberal society can be enacted as legitimate laws only if they are justified by public reason. This society's stability can hence be secured. However, in a pluralistic society does public reason exist? Is there one or more than one public reason? Does Rawls's idea of public reason generate any problems? These are main questions discussed in this article.