ABSTRACT Name : Chanadya Study Program : Information System Title : Analysis of the Effect of Social Support on Trust on Social Commerce and Its Impact on Intention to Purchase and Actual Purchases: A Trust-Transfer Perspective Counsellor : Dr. Putu Wuri Handayani, S.Kom., M.Sc. dan Ave Adriana Pinem, S.Kom., M.Kom. The popularity of social commerce lead to consumer's dependence on the shopping experience of other consumers. The exchange of informational and emotional support encourages the interaction among users hence trust plays an important role on social commerce. This study was conducted to determine the effect of social support (emotional and informational support) on trust and its impact on intention to purchase to actual purchases made by users. This study examines trust in social commerce from a trust-transfer perspective where trust-transfer occurs from members to platform and from platform to seller. The respondents of this study are consumers who have done transactions through social commerce. Data was collected using an online survey which was distributed via social media. A total of 1,366 valid data were collected and processed with CB-SEM method using AMOS 24.0 program. The result shows that informational support has significant effect on trust towards members and trust towards sellers and emotional support on trust towards members. However, emotional support has no significant effect on trust towards seller. This research also found that trust-transfer was occurred from members to the platform and from the platform to the seller. In addition, trust has a significant effect on intention to purchase which also has a significant effect on actual purchases. Key words: actual purchase, intention to purchase, social commerce, social support, trust-transfer theory