The purpose of the present invention is to provide a medical-image processing device with which the likelihood of human error can be reduced. This medical-image processing device is provided with: a first extraction unit which extracts a plurality of coronary arteries depicted in data of images of a plurality of cardiac phases, and which extracts at least one stenosis region depicted in each of the extracted coronary arteries a calculation unit which calculates pressure differences for each of the extracted coronary arteries on the basis of tissue blood flow volumes of the plurality of extracted coronary arteries a second extraction unit which extracts an ischemic region depicted in the images an identification unit which identifies a responsible blood vessel for the ischemic region by referring to a control map in which the extracted ischemic region is associated with each of the extracted coronary arteries and a control region, and which identifies a responsible stenosis on the basis of the pressure difference corresponding to the stenosis region in the identified responsible blood vessel and a display control unit which displays, on a display unit, an image in which the identified responsible stenosis is depicted, and information indicating the responsible stenosis.La présente invention a pour objet de fournir un dispositif de traitement dimages médicales permettant de réduire le risque derreur humaine. Selon linvention, le dispositif de traitement dimages médicales est pourvu : dune première unité dextraction qui extrait plusieurs artères coronaires illustrées dans des données dimages de plusieurs phases cardiaques, et qui extrait au moins une région de sténose illustrée dans chacune des artères coronaires extraites dune unité de calcul qui calcule des différences de pression de chacune des artères coronaires extraites sur la base des volumes de circulation sanguine dans les tissus des plusieurs artères coronaires extraites dune seconde unité dextraction qui e
