We report 4 adult cases of intussusception. The primary lesions were comprised of one benign tumor and 3 malignant tumors, that is, a lipoma of the cecum, malignant lymphoma of the ileum, transverse colon carcinoma, and sigmoid colon carcinoma. The male-to-female ratio was one to 3. Three malignant patiens were in their seventies. Preoperative freeing of intussusception was succeeded in only one case, and the remained 3 underwent emergency operation. It is said that adult intussusception is found in 5-10% of all cases of intussusception including infant cases, and 80-85% of adult cases commonly have an occult organic disease of the intestine. When classified by the regions, ileocecal intussusception is most frequently found, and colic intussusception has a low rate of incidence.Intussusception due to a lipoma of the caecum is rare.