Provided are an ultrasonic diagnostic device and an ultrasonic image display method having a function of displaying an inflow time map representing relative differences in blood flow dynamics such as inflow time of a contrast agent in difference colors, including a function of selectively extracting a focused vessel and constructing a noise-less inflow time map, and in the comparison of differences in color between the constructed inflow time map and the past inflow time map to examine a change in blood flow dynamics by therapy or the like, an interpolation function of unifying the color of regions as a base. A TIC analysis unit 13 calculates a parameter (tα) indicating an inflow starting time of a contrast agent and a difference of brightness ΔI due to the contrast agent using image data in a range designated by a image detection unit 11. A first pixel selection unit 15 selectively extracts a pixel meeting certain conditions and concurrently removes a non contrast-enhanced region. An image construction unit 16 constructs an inflow time map colored in accordance with the values of tα, and a second pixel selection unit 17 selectively extracts a vessel focused by an operator using a histogram based on the difference of brightness.
