Angiography of insulinoma must be taken to define location, size, number and metastasis before operation. Twocases of insulinoma which were confirmed in angiography in the department of radiology, S.N.U.H. were reportedwith literature review. One is located in the head of pancreas which is supplied from superior pancreaticoduodenalartery, 1.5×2cm in size. The other is located in the body of pancreas which is supplied from dorsal pancreaticartery, 2×2cm in size. Both cases are confirmed as benign islet cell tumor in operation and pathology.