PROBLEM TO BE SOLVED: To provide an ultrasonic diagnostic device capable of observing a time change curve for a plurality of cross sections by a single administration of a contrast medium.SOLUTION: The ultrasonic diagnostic device includes: an input part in which an operator performs input to indicate a desired part in an ultrasonic image of a plurality of cross sections based on an echo signal acquired by an ultrasonic probe a storage part for storing position information of a part corresponding to the desired part in a prescribed coordinate space, and specified based on the position of the ultrasonic probe and a time change curve creation part for specifying data based on the echo signal in a cross section including the desired part, on the basis of the position information of the data in the coordinate space based on the echo signal acquired from the subject to which a contrast medium has been administered, and the position information stored in the storage part, and creating a time change curve of a signal strength related to a predetermined region of the data.
