A 72-year-old man presented with abdominal aortic aneurysm (AAA) and was referred to our hospital by his physician. A computed tomography revealed a 95-mm AAA with three right renal arteries. The main right renal artery branched from the AAA, and two remaining arteries branched from the same level as the left renal artery. The patient underwent AAA repair and main right renal artery reconstruction without any renal protection. After the operation, renal function did not deteriorate. 3D-CT was useful for diagnosing renal artery branching, evaluation of renal blood perfusion, and determining the operation method.