Angiography of insulinoma must be taken to define location, size, number and metastasis before operation. Two cases of insulinoma which were confirmed in angiography in the department of radiology, S. N. U. H. were reported with literature review. One is located in the head of pancreas which is supplied from superior pancreaticoduodenal artery, $1.5 imes$2cm in size. The other is located in the body of pancreas which is supplied from dorsal pancreatic artery, 2$ imes$2cm in size. Both cases are confirmed as benign islet cell tumur in operation and pathology.