A biological information measurement device includes: a pressure sensor which includes a plurality of pressure detecting elements arranged in one direction； a pressing mechanism which presses the pressure sensor against a wrist of a person to he measured； a biological information calculating section which calculates biological information based on information of pressure pulse waves which are detected by the pressure detecting elements； and a personal identifying section which determines whether the person to be measured is a registered user who is previously registered or not, based on data indicating relationships between information of pressure signals which are detected by the pressure detecting elements of the pressure sensor in a pressed state where the pressure sensor is pressed against the wrist by the pressing mechanism, and positions of the pressure detecting elements in the one direction.
