PROBLEM TO BE SOLVED: To provide an ultrasonic diagnostic apparatus which easily measures an acoustic wave at an appropriate position.SOLUTION: An ultrasonic diagnostic apparatus comprises: a display part 6 for displaying a B mode image BI of a measurement object in a three-dimensional space, in which a propagation velocity of an acoustic wave generated by a mechanical vibration applied by a vibration applying instrument is calculated and a display image control part for letting the B mode image BI display an indicator In indicating a position of a straight line extending in a propagation direction of the acoustic wave from the vibration applying instrument in the measurement object on the basis of position information in the three-dimensional space of the straight line and position information of an ultrasonic image in the three-dimensional space.
