Obesity become worrying problem among adolescents, they who are obesed are 80% have the opportunity to experience obesity as adults and have higher risk of serious diseases such as cardiovascular disease, stroke, diabetes, asthma, and some types of cancer. According to the health profile of Yogyakarta Special Province in 2017 the prevalence of obesity was 19.1% occurs in adolescents. The main purpose of the research is to analyze the direct and indirect effects of gadget usage, sleep habit, stress, and physical activity on obesity. The population in this research was obese junior and senior high school adolescents, totaling 150 persons. Determination of samples is taken by simple random sampling. Independent variables consist of gadget usage, stress level, sleep habit, and physical activity. While the dependent variable is obesity. Bivariate analysis with chi-square test is applied for cathegorical data and independent T-test for numerical data. Multivariate analysis is carried out with path analysis, using the Amos version 22.0 software program. The results of this research found that the conclusions of the path diagram generated are as follow: 1) Gadget usage variable path coefficient value has a positive effect on physical activity. 2) Physical activity variable path coefficient value has a positive in effect on obesity. 3) Sleep habit and stress variable path coefficient value has a positive effect on gadget usage. It can be concluded that gadget addiction is directly related to sleep habits, stress, physical activity, and indirectly with obesity.