An ultrasound diagnostic device of an embodiment comprises an acquisition unit (18), an image generation unit (14), and a control unit (17). The acquisition unit (18) acquires setting information in which a plurality of types of ultrasound image data is set as display image data, and a proportion of time when displaying the display image data is set for each type. The image generation unit (14) generates in time series each of the plurality of types of ultrasound image data which is set with the setting information. The control unit (17) carries out a control which stores in a storage unit (16) the plurality of types of ultrasound image data which the image generation unit has generated, and a control which displays the display image data in a display unit (2) by the proportion for each type which is set with the setting information.