An ultrasonic diagnostic device and image display method display an inflow time map representing relative differences in blood flow dynamics such as inflow of a contrast agent, including extracting a 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, unifying the color of regions as a base. A TIC analysis unit 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 an image detection unit. A first pixel selection unit extracts a pixel and removes a non-contrast-enhanced region. An image construction unit constructs an inflow time map colored according to tα, and a second pixel selection unit extracts a vessel using a histogram based on ΔI.
