Human rights are of the basis for the local and international laws and bestow legitimacy on states. Furthermore, a vast number of theories in the field of humanities are evaluated based on their approaches to human rights. Despite widespread assumption that “ human rights” is a clear and commonly accepted concept, in this article I show the opacity of human rights both conceptually and extensionally. Also, I explain that, as long as “ human rights” is not clarified, the whole discussions on human rights in the fields of law, economics, politics and so on will be in vain, and the clarification of “ human rights” is possible only under philosophical examination of this notion. Human rights are of the basis for the local and international laws and bestow legitimacy on states. Furthermore, a vast number of theories in the field of humanities are evaluated based on their approaches to human rights. Despite widespread assumption that “ human rights” is a clear and commonly accepted concept, in this article I show the opacity of human rights both conceptually and extensionally.