An ultrasound diagnostic apparatus including an ultrasonic probe transmitting and receiving ultrasound toward and from a subject, a puncture adaptor configured to be fixed to the ultrasonic probe and to hold a puncture needle, wherein the puncture adaptor has moving part movable in relation to the ultrasonic probe with the puncture needle, and a sensor provided at the ultrasonic probe, and configured to detect the position of the moving part. As the puncture needle is moved relative to the probe, the movable part is correspondingly moved relative to the probe, and movement of the movable part, and therefore also of the puncture needle, is detected by the sensor.
