Sustainable development is often defined as development that provides for the needs of present generations without compromising future generations. An important determinant of the concept is that it advocates the necessary change in human behavior within many segments, but above all the understanding of the importance of sustainable development. The aim of this research was to examine the attitudes of future educators, i.e., students studying in university study of Early and Preschool Education in Rijeka on sustainable development and upbringing and education for sustainable development. To prove research, a survey questionnaire was constructed that contained adapted scales by Park, Kim, and Yu (2016). A total of 54 students (N = 54) in the first, second and third year of university study of Early and Preschool Education in Rijeka participated in the research. The obtained research results indicate that students studying in university study of Early and Preschool Education have the knowledge and understanding of education for sustainable development. The analysis of the research results showed that only a part of the students implement certain personal intentions and changes with the aim of a sustainable way of life. Educators have a significant role to play in developing children's sensitivity to sustainable development. This work and research results can serve as guidelines for a better understanding of the concept of sustainable development and the improvement of initial education of educators in the field of education for sustainable development.