An ultrasonic diagnostic apparatus comprising: an ultrasonic probe configured to transmit/receive ultrasonic waves to/from an object to be examined; an ultrasonic signal generating unit configured to generate an ultrasonic signal on the basis of the reflected echo signal, which is received by the ultrasonic probe, in the cross section of the tissue including the cardiac muscle of the heart of the object; an ultrasonic image generating unit configured to generate an ultrasonic image on the basis of the ultrasonic signal; a display unit configured to display the ultrasonic image; a measurement position setting unit configured to set a region of interest (213, 215, 217, 305) in the cardiac muscle on the ultrasonic image displayed on the display unit; a tracking calculation unit configured to track the movement of cardiac muscle in a plurality of meshed pattern measurement points in the region of interest (213, 215, 217, 305); and a physical quantity calculating unit configured to calculate a specific physical quantity on the basis of the tracking result, wherein: the calculated physical quantity is displayed on the display unit; and the tracking calculation unit tracks the plurality of meshed pattern measurement points using a plurality of first segmenting lines along the epicardium and the endocardium of the cardiac muscle and a plurality of second segmenting lines that are orthogonal to the plurality of first segmenting lines, characterised in that the plurality of measurement points are set on every intersections of the first segmenting lines and the second segmenting lines, and wherein the physical quantity calculating unit calculates both a radial strain and a circumference strain by using every two adjacent measurement points. an ultrasonic probe configured to transmit/receive ultrasonic waves to/from an object to be examined; an ultrasonic signal generating unit configured to generate an ultrasonic signal on the basis of the reflected echo signal, which is received by the ultrasonic probe, in the cross section of the tissue including the cardiac muscle of the heart of the object; an ultrasonic image generating unit configured to generate an ultrasonic image on the basis of the ultrasonic signal; a display unit configured to display the ultrasonic image; a measurement position setting unit configured to set a region of interest (213, 215, 217, 305) in the cardiac muscle on the ultrasonic image displayed on the display unit; a tracking calculation unit configured to track the movement of cardiac muscle in a plurality of meshed pattern measurement points in the region of interest (213, 215, 217, 305); and a physical quantity calculating unit configured to calculate a specific physical quantity on the basis of the tracking result, the calculated physical quantity is displayed on the display unit; and the tracking calculation unit tracks the plurality of meshed pattern measurement points using a plurality of first segmenting lines along the epicardium and the endocardium of the cardiac muscle and a plurality of second segmenting lines that are orthogonal to the plurality of first segmenting lines, characterised in that the plurality of measurement points are set on every intersections of the first segmenting lines and the second segmenting lines, and wherein the physical quantity calculating unit calculates both a radial strain and a circumference strain by using every two adjacent measurement points.