Abstract: This article is dedicated to the philosophical examination of the concept of “social capital”, which at the presents time exceeds the framework of sociology and social psychology. However, the confined empirical content of the notion of “social capital” does not allow revealing the profound aspects of the objects at hand and does not produce the expected result. The subject of the research is the dialectical logics of shifting of the concept of “social capital” from empirical level towards theoretical, and acquisition of philosophical content based on determination of the ontological grounds of social capital. In the course of this research, the authors apply the methods of conceptual analysis and synthesis, principles of primacy of social being, systematicity, and dialectical controversy. The scientific novelty lies in revealing the dialectics of emergence of the new socio-philosophical category of “social capital” on the basis of “paradigm vaccination”, which takes place in the process of implementation in economic and politological articles of the applied empirical notion of social psychology and sociology – “social capital”; as well as in determining the ontological grounds of theoretical content of the indicated concept. The author conclude that the notion of “social capital” of theoretical level can be productively applied in socio-philosophical studies of the objective potential of social development, foundations of its stability and sustainable development.