This research was conducted to assess the success of e-commerce from the perspective of the millennial generation in Indonesia. This research was conducted through a case study on the Bukalapak Application, which in recent times has decreased from the perspective of the number of visitors. This study refers to the DeLon and McLean Updated Information System Success Model. The measurement indicators used in this study were modified based on a review of several recent studies. Data collection was carried out using a questionnaire distributed to 291 respondents consisting of Bukalapak Application users who are included in the millennial generation in Indonesia. Based on the research results above, it can be concluded that all hypotheses can be accepted. Where the quality of information and customer satisfaction has a stronger influence on the use of the Bukalapak Application. Whereas service quality and system quality have a stronger influence on customer satisfaction in using the Bukalapak Application. Then user satisfaction has a stronger effect than using the system at a net profit. It is also known that the millennial generation in Indonesia also considers that the Bukalapak Application has good information quality, system quality, and service quality. Millennial also claims to have used the Bukalapak Application and expressed satisfaction with using the Bukalapak Application and stated that the Bukalapak Application was useful.