We report a case of a patient who underwent three-dimensional arterial computed tomography, color Doppler sonography and laparoscopic splenectomy for splenic artery aneurysm. Helical computed tomography revealed a splenic artery aneurysm, 3.0 x 1.8 cm in diameter. Color Doppler sonography reveals a weak pulsatile flow from the aneurysm. Surgical treatment is indicated for such cases since approximately 10% of these aneurysms tend to rupture which thus results in fatal hemorrhaging. As a result, a laparoscopic splenectomy was performed. According to our experience, three-dimensional computed tomography and color Doppler sonography can be performed for the arterial and venous information with less invasion than angiography and a laparoscopic splenectomy for splenic aneurysm can be performed which is safer and less invasive than conventional open procedure.