Objective: The aim of the research is to determine the importance of nurses / technicians in the prevention of negative attitudes of parents of preschool children and whether attitudes about immunization are positive. Methods and respondents: For the purpose of creating the empirical part of this paper, a questionnaire was conducted among 324 parents in the area of the city of Split. When collecting data for this survey, we used a two-part questionnaire. The first part of the questionnaire refers to demographic data and questions related to the vaccination of preschool children. In the study, an adapted questionnaire was applied to the questionnaire "Attitudes of parents about vaccines in childhood" (eng. Parent Attitudes about Childhood Vaccines (PACV). The questionnaire designed for this study contained sociodemographic data (age, gender, place of residence, marital status, level of education) and questions containing information about parents' attitudes about vaccination and sources of information about vaccination. Results: The results of the research show that the highest vaccination of children is against tuberculosis, i.e. bcg vaccine. Most parents have a positive attitude about the usefulness of vaccination for the prevention of certain diseases. The largest percentage of parents said that the primary source of information about the vaccine chose healthcare professionals and did not consider autism, cancer or diabetes as side effects of the vaccine. Conclusion: In conclusion, it can be pointed out that the attitudes of parents towards vaccination are mostly positive and most parents received primary information about the vaccine and possible side effects from the selected doctor.