Abstract Product liability is a form of civil law given by producers upon financial loss faced by consumers as the result of using products which are made or produced by the producers. The presumption of liability principle is the principle that is practiced by UUPK. Product liability principle which follows the strict liability principle is important because it gives protection to consumers who are in weak position especially in transactions. Applying strict liability principle in e-commerce transactions can give law protection for consumers in these transactions. Kata Kunci: Tanggung Jawab Produk, Konsumen, E-Commerce