To provide an ultrasonograph and a control program for the same for calculating a physical quantity related to elasticity of a living tissue in an elastic image display area more correctly.

The ultrasonograph uses points P, P' to be parts equivalent to an end part on a living tissue deep part side in a region of interest as set start points of correlation windows Wa, Wb, in echo signals Sa, Sb and successively sets the correlation windows Wa, Wb in the echo signals Sa, Sb toward Q, Q' to be parts equivalent to end parts on a body surface side in the region of interest from set start points P, P', and performs correlation operation between the correlation windows Wa and Wb, and calculates displacement in each part of living tissues.