Venous thromboembolism is believed to be rare in Japan, whereas increases in occurrence of pulmonary embolism have been drawing attention because it has become the most common cause of maternal death in recent years. A 36-year-old woman at 33 weeks of pregnancy was transferred to our hospital because of placenta previa totalis and treated with emergency cesarean section on the same day. Soon after the delivery of the fetus, the patient developed pulmonary embolism. The condition of pulmonary embolism was suspected when abnormal values were noted in respiratory and circulatory parameters and then confirmed by intraoperative transesophageal echocardiography, which revealed a thrombus in the right atrium. Anticoagulant treatment with unfractionated heparin started during the operation caused a tendency to bleed during and after the operation, and subsequently required a second laparotomy to control bleeding. After insertion of an inferior vena cava filter, a third laparotomy was performed to remove a giant hematoma. Heparin discontinuation intended to decrease the tendency to bleed was followed by two recurrences of pulmonary embolism, resulting in a dangerous condition. Despite these difficult complications, our interventions successfully saved the patient's life and restored her health. We report changes observed in her conditions along with treatment and management we provided, and describe the specificity of pulmonary embolism occurring during the operation.