This study was conducted to determine the effect of trust, ease, quality terhdap purchase decision information online. Settings used in this study is Bukalapak.com, which is one of the leading online marketplace in Indonesia. This research is a kind of quantitative research conducted by the survey. Data collection techniques used in this study by questionnaire (questionnaire) which are distributed online. Samples were students at the University of Muhammadiyah Yogyakarta ever transaction in Bukalapak.com. The number of samples in this study were 125 respondents. Sampling technique used is non probability sampling with purposive sampling method. Analytical tool in the study using multiple linear regression analysis. The results showed that confidence, ease, and quality of information is significant and positive influence on purchasing decisions. In this study, the trust has a stronger influence on purchase decisions compared with the ease and quality of information.