We report two cases of inguinal hernia difficult to diagnose hernia classification. Case 1: The patient was a man in his 70 s who presented to our hospital because of a 4 cm bulge on the cephalic side of the right inguinal ligament. Preoperative computed tomography (CT) revealed prolapse of the small intestine into the right groin, which was diagnosed as an M3-type inguinal hernia. He underwent the transabdominal preperitoneal approach (TAPP). On examination of the abdominal cavity, coexisting M3/F2 inguinal hernias were diagnosed. A retrospective CT revealed a femoral hernia in the coronal section image. Case 2: The patient was a woman in her 80 s who presented with a 6 cm bulge on the cephalic side of the right inguinal ligament. Based on physical examination and CT findings, she was diagnosed with coexisting L2/F1 hernias and underwent TAPP hernia repair. Multiplanar reconstruction-CT is useful for hernia classification. TAPP hernia repair is a technique capable of accurately diagnosing and reliably repairing coexisting inguinal hernias.