Provided are an ultrasonic diagnostic device and an ultrasonic image processing method which are capable of reducing clutter and motion artifacts. This ultrasonic diagnostic device comprises a tomographic image data generation unit, a blood flow information generation unit, a change detection unit, and a condition modification unit. The tomographic image data generation unit sequentially obtains tomographic image data of a subject for a plurality of times. The blood flow information generation unit obtains blood flow information by performing a process to a received signal based on a signal processing condition that includes a speed threshold relating to blood flow information of the subject. The change detection unit receives multiple tomographic image data the times of which are different from one another and detects the degree of change in a time axis direction. The condition modification unit modifies the signal processing condition on the basis of the degree of change in the time axis direction detected by the change detection unit. When the condition modification unit modifies the signal processing condition, the blood flow information generation unit performs a process on the received signal based on the modified signal processing condition and obtains the blood flow information.La présente invention concerne un dispositif de diagnostic à ultrasons et un procédé de traitement d'images échographiques qui sont capables de réduire les artefacts d'échos parasites et de mouvement. Ce dispositif de diagnostic à ultrasons comprend une unité de génération d'images tomographiques, une unité de génération d'informations relatives à la circulation sanguine, une unité de détection de mouvement, et une unité de modification de condition. L'unité de génération de données d'images tomographiques obtient séquentiellement des données d'images tomographiques d'un sujet plusieurs fois. L'unité de génération d'informations relatives à la circulation sanguine obtient des informat
