To provide a dementia diagnosis support device which is capable of performing brain image analysis by using brain images that do not clearly show specific regions such as the parahippocampal gyrus or inferior horn of lateral ventricle, etc. and CT images that are clinically widely used, and which is capable of effectively supporting diagnosis of the type of dementia, the dementia diagnosis support device (100) extracts pixels which fall in a specific concentration range from an input brain image as a concentration range of interest, and represents the distribution thereof by graphics, a graph, or numerical values. When represented by graphics, the brain region is divided into a plurality of divided regions on the basis of the left-right brain symmetry, and for each divided region, a graph is displayed indicating the size of the concentration range of interest. When represented in a graph, with respect to points on the radius vector with the origin being the centroid of the brain region, a profile which shows the relationship between the distance thereof from the origin and the concentration value is obtained for all angles and normalized to produce a graph. When represented by numerical values, feature values which indicate the features of the concentration distribution are calculated and displayed.Selon linvention, pour proposer un dispositif de support de diagnostic de démence qui soit apte à réaliser une analyse dimage du cerveau par utilisation dimages du cerveau qui ne montrent pas clairement des régions spécifiques, telles que le gyrus parahippocampique ou la corne inférieure du ventricule latéral, etc., et dimages de tomodensitométrie (CT) qui sont largement utilisées cliniquement, et qui soit apte à supporter efficacement le diagnostic du type de démence, le dispositif de support de diagnostic de démence (100) extrait des pixels, qui tombent dans une plage de concentration spécifique, dune image du cerveau dentrée en tant que plage de concentration dintérêt,
