In many instances, the change of dimension of kidney provides an important clinical{{{{Right Kidney }}{{Left Kidney }}{{Length (cm) 11.93$pm$0.75 }}{{Width (cm) 6.22$pm$0.14 }}{{Legth (cm) 12.32$pm$0.47 }}{{Width (cm) 6.32$pm$0.47 }} }} value, and often is decisive to evaluate the diagnosis and treatment of the renal disease. The kidney size was measured on abdominal roentgenograms obtained during intravenous pyelography in 315 normal Korean male. The result obtained are as follows: 1. 2. The right kidney size is smaller than the left one, and mean difference is 0.4cm. 3. In the elder group, it showed little relation between age and kidney size.