抄録
Regarded as a rule of international Law, rebus sic stantibus poses the questions of how it originated and what effects it has hed. I have considered these questions as the focus of the present study. As a result of it, one of the most interesting features of 'rebus sic stantibus' is that it has been interpreted differently in each historical period as to serve a purpose particular to that given period. In order to emphasize the historical aspects of 'rebus sic stantibus', I have traced its development from its appearance to the present day, in terms of how it has been practiced by States.
