Providing an ulttrasonic blood vessel inspecting apparatus which is capable of obtaining a clear ultrasonic image of a blood vessel, even where an operators manipulation skill is low. Cross sectional blood vessel image generating means 82 successively generates a longitudinal cross sectional image of the blood vessel located below a skin of a live body 14, by using an ultrasonic probe 24 placed on the skin of the live body 14, and index value calcvdating means 84 calculates a front wall portion image clarity index value XCRp indicative of a degree of clarity of an image of a front wall portion of an intima-media complex existing within the longitudinal cross sectional blood vessel image, and a back wall portion image clarity index value XCRB indicative of a degree of clarity of an image of a back wall portion of the intima-media complex existing within the above-described longitudinal cross sectional blood vessel image. Accordingly, the operator can position the ultrasonic probe 24 so as to increase the degrees of clarity of the images of the front wall portion and back wall portion within the above-described longitudinal cross sectional blood vessel image, on the basis of the front wall portion image clarity index value XCRF and the back wall portion image clarity index value XCRB, SO that the longitudinal cross sectional blood vessel image can be obtained with a high degree of clarity, even where the operators manipulation skill is low.
