Abstract : This article is devoted to the issues of development of main tendencies of social mobility in Uzbekistan, main directions of replenishment of entrepreneurs as well as key aspects of such discipline as sociology of entrepreneurship. The author considers entrepreneurship to be the activity of individuals aimed at the production of material and spiritual goods and services for the systematic generation of profit. At the same time, the importance of diluting the concepts of "business" and "entrepreneurship" has been proven. The term "middle class", which has actively entered the public consciousness and scientific turnover in the last two decades, still does not have a clear definition and unified methodology of research. The fact is that the middle classes cannot be described by one integral criterion. This is a social totality characterized by a chain of attributes, which include material and non-material resource attributes (level of income, education, business legitimacy, investment preferences, etc.) Nevertheless, today there is already a common understanding of some characteristic features of this social layer. The "middle class", like any other unit in the social structure of society, is recruited from a variety of backgrounds. Social mobility has played a major role in its replenishment, as the history of the middle class is closely linked to the expansion and acceleration of social mobility flows in modern society. The creation of a mobile and simultaneously stable society was possible only when the middle class became an important element of the social structure.