Provided is an ultrasound diagnostic device which is configured to be connectable to an ultrasound probe, and with which IMT of a carotid artery wall is measured, comprising: a transmission unit which supplies to an ultrasound probe a transmission signal for causing the ultrasound probe to transmit ultrasound along a longitudinal cross-section of a carotid artery a receiving unit which receives a signal based on the reflected ultrasound which the ultrasound probe receives from the carotid artery and generates a received signal a blood vessel characteristic computation unit which, on the basis of the received signal, extracts location information which includes a location of each part which configures the carotid artery wall and/or a relative relation between the locations, and detects a boundary location between the common carotid artery and the bulb of the carotid artery on the basis of the longitudinal change of the carotid artery of the location information an ROI establishment unit which, using the boundary location as a reference, establishes an ROI which defines the measurement range for measuring the IMT and an IMT measurement unit which measures the IMT of the blood vessel wall which is included in the ROI.La présente invention concerne un dispositif de diagnostic à ultrasons configuré pour être raccordable à une sonde à ultrasons, et avec laquelle lIMT dune paroi carotidienne est mesurée, ledit dispositif comprenant : une unité de transmission qui fournit à une sonde à ultrasons un signal de transmission pour entraîner la transmission dultrasons par la sonde le long dune section transversale longitudinale dune carotide une unité de réception qui reçoit un signal basé sur les ultrasons réfléchis reçus de la carotide par la sonde à ultrasons et qui génère un signal reçu une unité de calcul des caractéristiques du vaisseau sanguin qui, sur la base du signal reçu, extrait des informations de positionnement qui comprennent un emplacement de chaque partie qui c
