An ultrasonic diagnostic apparatus is provided for allowing a displacement between a direction of an acoustic line of ultrasound and a direction of movement of biological tissue to be recognized. The apparatus includes a strain calculating section for calculating a strain in biological tissue based on two temporally different echo signals in an identical acoustic line acquired by an ultrasonic probe an elasticity image data generating section for generating data for an elasticity image according to the strain calculated by the strain calculating section a movement detecting section for detecting movement of the biological tissue in a B-mode image an angle calculating section for calculating an angle between a direction of an acoustic line of ultrasound transmitted/received by the ultrasonic probe and a direction of movement of the biological tissue detected by the movement detecting section and an image display processing section for displaying an indicator indicating the angle.
