PURPOSE: To correctly recognize a plurality of bloodstreams different in reaching time and blood concentration characteristics of a contrast medium. CONSTITUTION: An ultrasonic diagnostic apparatus 200 is equipped with an ultrasonic probe 1, a transmission and reception section 2, a crossflow detector 3, a power computation section 4 computing the power P of bloodstream, a power peak holding section 21 comparing the latest power P and a peak value Po just before and outputting a greater value as a peak value P' and outputting elapsed time t' corresponding to the peak value P', an immediately before power and elapsed time retaining section 22 retaining the peak value Po just before and elapsed time corresponding to the value and outputting to the power peak holding section 21, a timer 11 measuring elapsed time t from a reference time, a bloodstream image generation section 25 changing a hue depending on whether elapsed time t' is before or after a hue changing time tc, generating a power peak holding bloodstream image G2 whose brightness is changed in response to the peak value P', a control section 12 resetting the timer 11 and setting the hue change time tc, and a display 6. For example, bloodstream of the hepatic artery and bloodstream of the portal vein can be differently colored and displayed.
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