Hospitalization may cause children in crisis. Therefore, a parent's role is needed to minimize the impact of hospitalization. A preliminary study conducted by researchers through interviews with nurses showed that preschool children who were treated at hospital showed a less cooperative attitude when nursing actions were done. This study was aimed at determining the role of parents in overcoming the impact of hospitalization on preschool children in Subang District Hospital. This study used Quantitative research design and descriptive approach involving 60 parents whose children were treated at Subang District Hospital. Accidental sampling technique and questionnaires were used in this study. The results indicated that 56% of children showed a negative impact on hospitalization and 74.0% of parents played a good role in children hospitalization. This study suggests that Subang district hospital needs to provide an education for parents in overcoming the impact of hospitalization on children. Moreover, aside from the parent's role, environment can also affect hospitalization negatively. Regarding this, the hospital can create an inpatient ward that is decorated with many colours and children' favourite cartoon images to reduce the negative effect of hospitalization.