An ultrasonic diagnostic apparatus of the present invention capable of operation with a three-dimensional ultrasonic image performs a scan with a 3D probe for a predetermined time to acquire 3D volume data, and displays a plurality of sections of a heart on a monitor display, in conducting a functional diagnosis of the motion of the heart walls of a specimen before and after the application of a load. Then, the ultrasonic diagnostic apparatus displays a positional relation between the probe and the heart so that display angles of the sections of the heart displayed on the monitor display may be constant.
