This is the case of a 40-year-old, 34-week pregnant woman, who had bloody stools and abdominal pain from 20 weeks gestation. She presented to our department as she noted an exacerbation in her abdominal pain, and was admitted. Sonography and magnetic resonance imaging displayed a mass with an appearance consistent with intussusception, hence intussusception was diagnosed. The patient underwent a cesarean section and concurrent partial colectomy, which showed that she had a colon cancer. There were no postoperative complications. Colon cancer as a complication of pregnancy is rare. We encountered a case of a patient with colorectal cancer that caused intussusception in the latter half of pregnancy, and report it here with a review of the literature.