Introduction: Despite many efforts from the government of India, free of cost immunization and ongoing National immunization program, the result of immunization coverage in our country is not satisfactory. The present study is conducted to find out the factors that cause incomplete immunization. Aims: To assess the factors causing non-compliance of immunization by the parents of 0-5year children. To find out the association between non-compliance of immunization with their selected demographic variable. Methodology: The present study was carried out as a non-experimental survey. A total of 169 parents of children aged 0- 5 years were included in the study. The data was collected regarding demographic information, immunization status, doses of vaccines and factors responsible for incomplete immunization by interviewing parents, by dichotomous (yes/no scale) and by checking vaccine card. Validity was checked by experts and reliability was done by test-retest correlation. Results: The result shows, number of children with complete and partial immunization was 66.27% and 33.72% respectively. 25.44% of parents believe the vaccine is against religion and culture, for 33.13% of children the barrier of vaccination is the tim ing of immunization centre, distance or cost to reach immunization centre, 20.11% skipped vaccine due to lack of vaccines in Immunization centre, 0.07% believe the vaccine can hurt baby, 48.52% did not get proper information regarding immunization from health care providers. There was a significant association between age of parents, source of information, education and occupation of parents and non-compliance of immunization. Conclusion: This study showed that some children have not completed vaccines according to their age. So, health care provid ers should be more active to motivate the parents to give all immunization in the proper scheduled time.