To easily carry out both observations of screening and careful examination in ultrasound elastography without taking trouble, an ultrasound observation device includes an ultrasound image generation unit that generates data on an ultrasound image based on an ultrasound signal, a region of interest setting unit that sets a first region of interest preset within the ultrasound image and that automatically sets a second region of interest relatively stiff in the first region of interest, and an elastic image generation unit that generates data on first and second elastic images each having a display mode according to stiffness of the corresponding first and second regions of interest.
