A measurement device includes a detection device to detect a pulse wave signal at a first measurement location in a vascular pathway from the heart of a measurement subject to an area where an arterial aneurysm is predicted to occur and a pulse wave signal at a second measurement location in a vascular pathway from the heart of the measurement subject to an area that is different from the area where an arterial aneurysm is predicted to occur, a comparison device to calculate a comparison result by comparing frequency characteristics between the pulse wave signals, and a determination device to determine at least one of the presence/absence and size of an arterial aneurysm based on a predetermined characteristic amount for a frequency contained in the comparison result.
