Introduction: The use of gadgets will cause changes patterns, lifestyles and activity in preschoolers. Children who play gadgets tend to be quiet and absorbed in their gadgets. This will cause the child to become less activity (sedentary behavior). Method: This study used a correlational research design with cross sectional approach. The sampling technique uses purposive sampling. The number of samples of this study were 45 respondents. The independent variable in this study is the use of gadgets, and the dependent variable is sedentary behavior. Results: The results show that the use of gadgets is mostly in the moderate category and sedentary behavior in the heavy category. Spearman test results, s Rho obtained ρ = 0.002 means that there is a relationship between the use of gadgets and sedentary behavior Discussion: The use of gadgets is related to sedentary behavior which is influenced by the child's sex, parental work and changes in behavior patterns. Suggestions for parents to always accompany children and play and provide activities that are appropriate for child development.