The purpose of this paper is to examine sport ethics, especially the ethical and moral issues of sport players, based on Kant's ethics. First, we will start by asking the validity of the interpretation of Kant's ethics, which has been done in the field of sport ethics up to now, that is, the establishment of the "universal law" made by absolute gaze. This is because in Kant's ethics, the most important point is the internal principle of the person. Among the internal principles, paying attention to “ungern”, we examine the moral goodness in the practice of sport players along with the effect of the internal principles of Kant's ethics.
As a result of examining from these viewpoints, it is suggested that the location of “ungern” is important in the internal principle of sport players in facing ethical problems.
