We experienced 2 cases of obturator hernia, which were preoperatively diagnosed as adhesive intestinal obstruction but conservative treatments failed to provide any remission, and laparotomy that these cases were of intestinal obstruction due to incarcerated obturator hernia. Case 1 was a 75-year-old woman who was referred to our hospital by her previous doctor because of abrupt anorexia, vomiting, and nausea associating with hypogastralgia. There was a history of appendectomy. After hospitalization, she was under observation of the course with the insertion of an ileus tube, but was operated on because no remission could be obtained, proving to be intestenal obstruction due to incarcerated obturator hernia. Case 2 was a 76-year-old woman having a history of cholecystectomy, who was examined by her previous doctor for abrupt abdominal pain and absence of defecation and was diagnosed as adhesive intestinal obstruction. After hospitalization, she was under observation of the course with the conservative treatment, then was referred to our hospital because no remission could be obtained. The patient was operated on, proving to be intestinal obstruction due to incarcerated obturator hernia, complicated with peritonitis due to perforation the intestine. The patient died of complications inducing sepsis and ARDS.