The thesis describes the importance of socially responsible business in the HŽ Infrastruktura d.o.o. company. Nowadays the socially responsible business has become the object of increasing interest. The term and the practice of corporate social responsibility have been analyzed in its broadest sense, which includes the entire range of company's action and all relations to have emerged out of it. A theoretical analysis has shown that the HŽ Infrastruktura d.o.o. company uses the socially responsible business to contribute to a sustainable development as a prerequisite of its own business success and meeting the needs of its stakeholders. The HŽ Infrastruktura d.o.o. company develops its legal, moral and economic responsibility, and mostly responsibility towards the environment, which is obvious through an energy efficiency action plan, environmental protection, activities which include quality management, planning of new activities, safety and promotional activities. The results of the analysis indicate that the awareness of socially responsible business should be raised, the environment taken care of, corruption be fought, it should be contributed to a community development and dealt with occupational health and safety.