An ultrasonic diagnostic device is characterized by being provided with a cooling mechanism for cooling an ultrasonic vibrator by circulating a refrigerant in a cable of an ultrasonic probe in which the ultrasonic vibrator is provided, a cooling abnormality detecting means for detecting the abnormal state of the cooling mechanism, and an operating means for, when the abnormal state of the cooling mechanism is detected by the cooling abnormality detecting means, performing a degraded operation in which the transmission/reception condition of the ultrasonic vibrator is changed according to the detected abnormal state.