To provide an ultrasonic diagnostic apparatus capable of reducing influence of a depth of an examining region and obtaining an MTT with good accuracy and with high reproducibility by short-time scanning.

An ultrasonic wave transmitting part 6 transmits ultrasonic pulses for breaking a contrast medium one or more times to one scan surface of a patient to which a contrast medium is administered. An ultrasonic wave receiving part 5 receives an echo signal group based on the ultrasonic pulses from the patient, and the echo signal group is added by an adder 5C to generate a plurality of RF data. According to the plurality of RF data, a TIC. MTT measuring part 25 measures a luminance change curve (TIC). According to the luminance change curve, the average passing time (MTT) of a bloodstream is measured on the basis of the luminance change curve and displayed on a display part 21.