Gen Z is a generation that likes online shopping more than other generations. Bukalapak is one of the e-commerce sites that is least visited, so there are fewer purchasing decisions compared to other competing e-commerce sites. This research examines Gen Z's purchasing decisions, especially on the Bukalapak application. This research uses quantitative research with a sample of 400 respondents. The data analysis uses the help of the PLS (Partial Least Squares) application. The research results show that seller reputation and trust influence purchase decisions, while online customer reviews do not directly influence purchase decisions. However, online customer reviews indirectly influence purchase decisions mediated by trust.