Malignant melanoma is a relatively rare disease in Korea. But its incidence is increasing. The potentiality of malignant melanoma to metastasize to all parts of the body is well known. An often-unsuspected complication is metastasis to the gastrointestinal tract, which leads to bowel obstruction or intussusception. The most common symptoms in patients with gastrointestinal metastasis are vomiting, abdominal pain and abdominal distension. We experienced a case of malignant cecal melanoma presenting as adult intussusception. The primary origin was not found. We managed by right hemicolectomy with DTIC chemotherapy.