World Health Organization (WHO) reports that 5-25% of preschool-aged children suffer from developmental disorders, one of the factors that influence is the use of gadgets. If a child experiences a social development disorder, it is feared that the child will experience difficulty in adjusting himself, especially with the demands of the group, the child's independence in thinking and behaving, and most importantly the disturbance in the formation of self-concept of a child. This study aims to determine the relationship of the duration of use gadget to the development of preschool children. The research design used in this study was an analytical survey approach cross-sectional where the independent variable duration of use gadget and the dependent variable of child development are collected at the same time. The population was 46 children aged 5-6 years. The results showed that most of the children (56.7%) experienced a dubious development while the test results Chi-Square showed a p-value of 0.008, which means there is a relationship between the duration of the use of gadgets for the development of preschoolers with an OR = 14.875 means that the duration of use gadget in children is 14.875 times affecting children's development. The results of this study are expected parents/guardians to be more selective in giving toys to children, especially permitting to play gadgets.