Abstract
Despite the ban of the advisory opinions in the federal level, ten states adopt the advisory opinions. Even though advisory opinion is not so common in the U.S., there are many arguments pros and cons about advisory opinions. On the other hand, in Japan, advisory opinions were almost a "forgotten topic" and have not been discussed much. Without much discussion, advisory opinion is considered as out of the sphere of the constitution. However, there should be some arguments before abandoning advisory opinion- there could be possibilities for adopting advisory opinions. This article illustrates advisory opinion in federal and states, and discussion concerning the advisory opinions, in order to set a start line for the discussion in Japan.
