This study elaborated the continuation of Japan’s whaling under the special permit given by the International Whaling Commission (IWC). After the moratorium of commercial whaling issued by the IWC, Japan as a member state was looking for a loophole within the convention by proposing a scientific research to continue its whaling program. In decades, the IWC has still been unable to handle the whaling issue conducted by Japan. On the other hand, the method used in this research was qualitative method by using secondary data such as books, articles, journals, e-news, reports and other literary sources. The concept of international organization and the theory of international regimes are the tools used to examine the issue. Thus, this undergraduate thesis has successfully analyzed the failure of the IWC in tackling Japan’s whaling in the Antarctic Ocean. The author has found out some factors that would be best explain regarding this issue. They are regime’s lack of power, the ambiguity of the regulations, and the lack of supervision.