Abstract: A blood measurement device (10) includes a light emitting part (11) that emits a light beam that is to transmit through a measurement site (18), a light receiving part (19) that receives the light beam that has transmitted through the measurement site (18), an integrating sphere part (14) interposed in an optical path along which the light beam emitted from the light emitting part (11) reaches the light receiving part (19), the integrating sphere part (14) having formed inside a reflection surface (26) that reflects the light beam, a light entry part (23) which is an opening provided at the integrating sphere part (14) and through which the light beam applied from the light emitting part (11) enters an inside of the integrating sphere part (14), and a light exit part (16) which is an opening provided at the integrating sphere part (14) and through which the light beam reflected by the reflection surface (26) of the integrating sphere part (14) is emitted from the integrating sphere part (14) toward the measur

Abstract: Provided is a blood measurement device capable of accurately estimating the amount of a component contained in blood by passing light beams for calculating the amount of the component contained in blood along the same optical axis. A blood measurement device 10 of the present invention includes a light emitting part 11 having a first light emitting part 111 and a second light emitting part 112, a light receiving part 19, an actuator 16, and a computation and control part 17 that estimates a glucose level and controls operation of the actuator 16.