An ultrasound diagnostic device including an ultrasound image acquirer that acquires a plurality of ultrasound image signal frames； an angle information acquirer that acquires angle information of an ultrasound probe when each frame is being acquired； an evaluation determiner that analyzes the frames to determine whether an object image portion is included； a disease score calculator that calculates a disease score that quantitatively indicates a degree of disease from a signal of the object image portion； and a display controller that makes the diagnostic image be displayed. A diagnostic image includes an ultrasound image of a frame selected from the frames, a disease activity information indicator that indicates a degree of disease, and an angle information image portion that indicates angle information.
