Where do pleasure and fairness come from in a sport game, and why should moral discourse be discussed? It can be found from the observation of a game’s reasonable rules and practice of fair game playing. Thus, the view of an ethos to a sport game demands a game player’s moral responsibility because a game’s ethos works as the ground for operating a game reasonably based on conventional moral norms. And discourse ethics in sport games is discussed from what is about critical attempts to explain a moral perspective from deontology and communicative preconditions. It is a known fact that the fundamental direction of value in contemporary society lies in diversity and pluralism. We can understand that practical aspects like sports provide the field. The moral virtues preserved and reproduced by sport players, judges, coaches, and delegates in the system come to be combined so that idiomatic discourse ethics and communicative behavior can preserve a fair game. Of course, discourse ethics is not the interest of post-conventional or post-enlightenment ethics. The aspects of discourse ethics focus on the practice of fairness, the permanent semantic condition of sports, through practical discourse. In other words, as the semantic condition of sports, the principle of fairness and principle of justice are restructured into the principle of discourse ethics because discourse premises a mutual, equal relationship and justice is the principle that secures equality.