Case method is a teaching method that students learn through discussions based on case materials. This research scrutinized 11 previous studies related to the case method on Japanese language education, from the viewpoint of 10 categories, and compared this to the case method in Keio business school. As a result, four important suggestions were derived: aiming for renewing the self-model, not limited to interpreting the case, having more detailed case description and lengthen the time of class discussion, sharing participants’ information and explaining the principles and cautionary points in advance, and providing efficient and carefully prepared questions during discussions.