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The increases prevalence of obesity is due to the instant diet of children cause of globalization. The aim of this study was to determine the relationship between junk food consumption with child obesity. This study was conducted on 175 pupils which age 9-12 years old and has parents with no history of obesity in West Denpasar District using analysis cross sectional approach. Obesity determined as BMI by age more than Z score 2 while junk food consumption determined as consuming low-nutrient foods contained fat and soft drinks at least once a week. The collected data analyzed with SPSS 21 using Chi-Square test for relationship of junk food consumption and child obesity whereas multiple logistic regression analysis to controlled the influences of variables parents-s education, parents-s income and child-s physical activity. Prevalence of obesity was found 18,3% which 21 pupils found with obesity was consuming junk food, while 11 pupils found with obesity wasn-t consuming junk food. The result was showed as follow: relationship between junk food consumption with child obesity was positive significance (p <0,05), OR 2,56 and IK 95% 1,15-5,72. After controlled with another variables, the relationship still significant with Adjusted Odd Ratio 0,32. It can be concluded that there was relationship between junk food consumption and child obesity.