This study aims to find out and analyze the influence between peer conformity to consumptive behavior in students Ar-Roudloh dormitory Putri Utara Darussalam Islamic Boarding School Blokagung Banyuwangi.This research is quantitative research using cause and effect correlation research. The population of this study was all Ar-Roudloh dormitory students who numbered 66 students, with a sample of 57 students. To measure variables, researchers used questionnaires to influence peer conformity (X) and consumptive behavior (Y).The results showed that peer conformity had a significant effect on consumptive lifestyles according to an analysis of t tests that showed that the value ρ 0.000 < 0.05 (thitung 23,670 > 1,672). While the result of determinant test (R 2 ) of 0.911 which means dependent variable (consumptive behavior) can be explained by independent variable (peer confomitas) 91.1%. From the analysis, it can be concluded that accepting Ha and rejecting Ho means that there is a significant influence between peer conformity and consumptive behavior students Ar-