Provided is a medical image processing device capable of notifying the diagnosis personnel that a segmentation error has occurred or may have occurred during tissue segmentation processing. This medical image processing device (1) specifies a gray matter image of a subject (S31), smoothes the gray matter image (S32), and, in accordance with an elevation function for calculating an absolute Z score, calculates an elevation value (S33). Next, the medical image processing device (1) compares the evaluation value with a pre-defined threshold value and determines the segmentation result (S34), and, if the separation result is determined to be abnormal ("abnormal" in S35), warns that segmentation result is abnormal (S38) and displays a segmentation result display screen showing the segmentation result (S39).
