The article offers an analysis of Józef Bocheński's studies of the concept of nation. Bocheński acknowledges that there are difficulties in defining a nation. After that he claims that he will attempt to propose a definition of the Polish nation. Nation is a social group centered around some cultural ideal. The analysis shows that Bocheński did not avoid serious logical problems. First of all, he constantly falls into a circular reasoning. Furthermore, it is called into question if it makes sense (...) to refer to a cultural ideal or ideology while defining a nation. Is not such an attempt essentially bound to become circular? A doubt is also raised whether nowadays, in the face of constant migration of people and cultural ideals, one can continue to reasonably talk about nations. (shrink)