Entrepreneurship is a generator of economic and social development. However, an important prerequisite for economic and social development is the ecosystem, or the infrastructure that supports this development. The foundation for building a quality and sustainable small and medium-sized enterprise sector is a good entrepreneurial infrastructure. Entrepreneurs face various problems in business. Investment in research and development and engagement of consultants can be key to the long-term success of companies in a competitive business environment. The consulting support for small and medium-sized enterprises in Croatia is provided by private consulting companies and entrepreneurial support institutions. According to the Law on the Improvement of Entrepreneurial Infrastructure, entrepreneurial infrastructure includes entrepreneurial support institutions and entrepreneurial zones. The Unified Register of Entrepreneurial Infrastructure registers 534 units of entrepreneurial infrastructure. The main objective of this paper is to present the role of entrepreneurial infrastructure in the development of the Croatian economy. The purpose of this paper is to demonstrate the importance of the small and medium-sized enterprise sector as well as the need to encourage and improve this sector. In the practical part of the paper, the goal is to present the entrepreneurial infrastructure of the Brod-Posavina County and the views of entrepreneurs on entrepreneurial support institutions gathered through in-depth interviews.