Provided is an ultrasonic diagnostic device in which a transmission unit outputs a transmission signal to a probe such that an ultrasonic wave is transmitted a plurality of times while the position of a sound source is changed. A reception unit obtains the received ultrasonic wave signal from the probe for each of the plurality of times that the transmission signal is transmitted. A synthesis processing unit synthesizes the received ultrasonic wave signals that are obtained over the plurality of times. A higher harmonic extraction unit extracts a higher harmonic component from the synthesized received ultrasonic wave signal. An image forming unit forms an ultrasonic wave image on the basis of the extracted higher harmonic component. A control unit adjusts the time interval of the plurality of times that the ultrasonic wave is transmitted and controls the transmission voltage of the transmission signal.
