PROBLEM TO BE SOLVED: To provide a renal function evaluation apparatus, program, and computer recording medium for noninvasively and simply, evaluating a renal function of a subject.SOLUTION: A renal function evaluation apparatus 10 comprises: renal function index means 32 for calculating a renal function index showing a renal function, on the basis of aorta blood flow data on a subject and evaluation means 34 for evaluating the existence or degree of renal dysfunction on the basis of the renal function index. The renal function index is a reverse blood flow/forward blood flow ratio (R/F ratio) of a descending aorta or characteristic impedance.
