This study aims to determine the factors which makes Impulse Buying, to identify the influence of the factors on Impulse Buying, and to determine of the factors that has dominant. Research type used in this research is explanatory research with quantitative approach.. The sampling technique used purposive sampling. The sample in this research is 116 respondent. Methods used in collecting data is spread questionnaires. Analysis of the data used is descriptive analysis, factor analysis, multiple regression analysis, and partial regression analysis. The results showed that there are five factors influence the impulse buying, such as Store Atmosphere Factor, Shopping Lifestyle Factor, Reference Group Factor, Brand Trust Factor, and Hedonic Shopping Motivation Factor. These five factors are simultaneously influence on Impulse Buying with R Square of 0,334 and a significance level 0,000 (p < 0,05). These five factors are partially having significant influence on Impulse Buying with a significance value of each ≤0,05 is 0,000; 0,000; 0.012; 0.014; 0,011. The dominant factor is the Store Atmosphere Factor can be seen from higher (B) value of 0,965.