An ultrasound diagnostic apparatus includes an ultrasound probe, an image producer, a monitor, a position designating unit for designating a target position when paracentesis is performed and an insertion position calculating unit for calculating an insertion position from information ON the target position designated by the position designating unit and a predetermined insertion angle and an insertion position display unit for displaying the insertion position calculated by the insertion position calculating unit. The ultrasound diagnostic apparatus ensures that a puncture needle inserted from a position away from an ultrasound probe to reduction the insertion angle so as to be imaged at a higher definition can also reach a target site.
