Obturator hernia is known to be a rare kind of hernia that often occurs in debilitated and / or aging women. High mortality rate has been reported to be due to delayed diagnosis and associated medical illness. Emerging evidence suggests that accurate preoperative diagnostic sensitivity can be obtained with abdominal computed tomography. Thus far, there is no consensus regarding the suitability of surgical repair for obturator hernia. Here we report three cases that have been diagnosed accurately with computed tomography. Among them, one has a history of therapeutic pelvic fracture. Thus we report here that pelvic injury may also constitute a risk factor for the occurrence of obturator hernia.