An ultrasound diagnostic apparatus comprising an ultrasound probe for transmitting/receiving an ultrasound wave with respect to a subject to be diagnosed； an ultrasound wave transmit section for transmitting an ultrasound wave for driving the ultrasound probe； an image generating section for generating an elastic image from elasticity information based on a reflected echo signal received from the ultrasound probe； a display section for displaying the generated elastic image； a pressing decision section for deciding whether or not a pressing operation is proper based on a distribution of the elasticity information； and a decision output section for outputting a decision result by the pressing decision section to the display section.
