We experienced a case of splenic torsion with a sudden onset of left abdominal pain and frequent vomiting in a 3-year-old girl. Before surgery, leukocytosis, thrombocytosis and elevated LDH were noted. Although CT of the abdomen revealed aspleen-like mass. Tc-99m scintiscan did not delineate the spleen at all. On operation, a 720counter-clockwise rotation of the spleen was found and the spleen was removed. Histologically, thrombus formation in the splenic artery and vein and coagulative necrosis of the splenic parechyma were found. In Japan, 29 cases of splenic torsion, including our case, have been reported; 10 of them in patients aged 10 years or below. In reviewing these 10 cases, we assumed that the fixability of the splenic ligament was congenitally poor in these cases and found that splenic tosion in children frequently developed with a sudden oneset of abdominal pain, vomiting, fever, etc. without prior recognition of a mass representing the floating spleen.