Providing a blood vessel function inspecting apparatus which is capable of obtaining an index value permitting evaluation of a blood state in a non-invasion manner, by measuring a blood flow velocity distribution within a blood vessel.First blood state index value calculating means 90 obtains estimated hematocrit values Hte at a plurality of points within a blood viscosity distribution DV and a blood shear rate distribution DSR, on the basis of values of a blood viscosity µ and values of a blood shear rate SR at the plurality of points, which are respectively extracted from the blood viscosity distribution DV and the blood shear rate distribution DSR, and according to reference relationships between a hematocrit value Ht and the blood viscosity µ, which reference relationships respectively correspond predetermined different values of the blood shear rate SR. Second blood state index value calculating means 92 calculates, as a blood state index value X1, a value relating to an amount of difference of the estimated hematocrit values Hte with respect to each other, which amount is minimized by transforming the reference relationships at the same ratio for all of the values of the shear rate SR. Thus, the blood state index value X1 permitting the blood state evaluation can be obtained in the non-invasion manner, to permit objective and easy evaluation of the blood state.
