An ultrasound diagnostic device includes: a transmission pulser that applies a driving pulse output signal to an ultrasonic transducer so as to cause the ultrasonic transducer to irradiate ultrasound and a trigger signal generator that generates a trigger signal that controls the transmission pulser to output the driving pulse output signal. The trigger signal generator adds, to the trigger signal in a predetermined term after completion of a driving term of the ultrasonic transducer, a plurality of trigger pulses that control an amplitude of an ultrasonic transducer output signal generated upon completion of the driving term so as to attenuate gradually. With this configuration, a free vibration of the ultrasonic transducer in a transient response can be suppressed with the minimum number of circuit materials.
