Since diaphragmatic injuries are difficult to diagnose, those that missed may present with latent symptoms.Delayed diaphragmatic hernia is very rare and occurs commonly after penetrating or blunt trauma. Recently we had experience with two cases of delayed diaphragmatic hernia after left nephrectomy.They were operated by herniolysis and closure of diaphragm using prosthetic patch[Dura, Dacron through the left thoracotomy. Postoperative courses were uneventful.