A biological information measurement device, personal identification device, personal identification method, and personal identification program which can easily perform personal authentication at low cost regardless of the physical condition are provided. A biological information measurement device 100 includes: a pressure sensor 10 including a plurality of pressure detecting elements 12 which are arranged in one direction； a pressing mechanism 20 which presses the pressure sensor 10 against the wrist of a person to be measured, in a state where the one direction intersects with the elongation direction of the radial artery TD that is under the skin of the wrist； a controller 30 which determines whether the person to be measured is a registered user or not, based on data indicating relationships between the absolute values of pressure signals which are detected by the pressure detecting elements 12 in a pressed state where the pressure sensor 10 is pressed against the wrist by the pressing mechanism 20, and the positions of the pressure detecting elements 12 in the one direction.
