The biological information measurement device includes a body part and a wearable part that is fixed on the body part and is to hold a finger of a living body. The biological information measurement device includes a light source unit and a light receiving unit that are arranged so as to oppose each other with the finger therebetween when the finger is held by the wearable part. The body part includes a power supply unit and an electric circuit that includes a signal processing unit. The signal processing unit acquires a digital value concerning a pulse wave from a signal output from the light receiving unit by the light receiving unit receiving light emitted from the light source unit and passing through the finger. A first length of the body part in a longitudinal direction is greater than a second length of the wearable part in the longitudinal direction.
