In recent years, there have been many accidents of pollution caused by oil overflow, which resulted in serious damages. In the procedure of dealing with claims for damages arises the issue of onus probandi. The proof burden for both parties is a key factor in the procedure of litigation. Therefore, study on the onus of proof for all the parties concerned plays an important role in the intensive understanding of the suit for damages caused by oil pollution from vessels. As an environmental tort, damage by oi...