Congenital diaphragmatic hernia through Bochdalek foramen, posterolateral diaphragmatic hernia, is the result of a congenital malformation of the posterolateral region of the diaphragm. Bochdalek hernia is the most common type of congenital diaphragmatic hernia, but it is a extremely rare anomaly which is detected in adulthood because it has severe cardiopulmonary and gastrointestinal symptoms after birth immediately.We experienced two cases of Bochdalek hernia which were detected in adulthood. Among them, one was a 43 years old man who was treated with simple closure in left Bochdalek hernia and the other was 41 years old woman who was treated with patch closure using silastic sheet in right Bochdalek hernia. Their postoperative courses were uneventiful. So we report two cases of rare Bochdalek hernia which was detected in adulthood with review of literatures.