Abstract
From descriptive interpretation of "understanding" to abstract-gnosiological understanding of mentality. The historical deconstruction of the existential understanding introduced as ontologic property of constantly becoming stable "Being-in-the-World" allows us to interpret this concept as mentality. Through theprism of existential philosophy in general and its interpreters such as Jacque Le Goff it allows us to make a conclusion that mentality is one of complete formations of public consciousness. But in the course of such interpretation of mentality it is important to avoid the methodological situation in which Plato deadlocked, when he had decided to find out, what was beautiful itself. For the way out from this situation he had to introduce independently existing ideas and special space of ideas which define all the things and even gods. We, unfortunately, do not have such an opportunity which the history gave to Plato. Somehow to define structural and historical conditions for breaking out of mentality we shall be limited to the instruction that it is more complex, compound, but in the same time integrally complete formation historically actualized, unlike traditionally allocated kinds and forms of consciousness. Another important question is whether the concept "mentality" is acceptable for analysis of the current modern processes or it can only be used for the reconstruction of the completed formations. The mentality cannot be analyzed from inside. And we are inclined to consider that to operate the concept "mentality" in relation to a modern representative of civilization is inappropriate.