A biological measurement device includes a probe including a contact surface that includes a plurality of light input portions that input light to a measurement target part and a plurality of light receiving portions that receive measurement light output from the measurement target part, the contact surface being pressed against the measurement target part, and a calculation unit that calculates internal information on the basis of a result of detecting the measurement light obtained for each combination of the light input portion and the light receiving portion, wherein the plurality of light input portions and the plurality of light receiving portions constitute lattices having an interval d in a first direction and a second direction orthogonal to each other on the contact surface.
