In this paper, I discuss the social structure of modern capitalist society in a new conception based on the theory of institutional sociology. In the first part of the paper, I briefly outline the social structure of modern capitalist society. Taking social relations into account in terms of certain types of social capital and social relationships, I differentiate the following social classes in the modern capitalist society: (1) authority class, (2) strong tolerated class, (3) supported class, (4) medial tolerated class, (5) patronized class, (6) restricted class, (7) less weak tolerated class, (8) less exposed class, (9) very weak tolerated class and (10) very exposed class. In the second part of the paper, I analyse the social structure or the social classes composing the social structure in more detail. In the third part, I point out further aspects that ought to be considered in the empirical research of the social structure of capitalist society