Metabolism measurement device, metabolism calculation method, and metabolism calculation program

This metabolism measurement device is provided with: a light source that outputs measurement light that is input to a living body; a light detector that detects measurement light propagating inside the living body and generates a detection signal corresponding to the intensity of the measurement light; and a calculation unit. The calculation unit obtains a first parameter and a second parameter on the basis of the detection signal. The first parameter is a temporal relative change amount dependent on the O2Hb concentration in the blood and the blood vessel volume in the optical path. The second parameter is a temporal relative change amount dependent on the HHb concentration in the blood and the blood vessel volume in the optical path. On the basis of the first parameter and the second parameter, the calculation unit obtains a value relating to the HHb concentration in the blood in which the influence of the blood vessel volume in the optical path is excluded. The calculation unit obtains data relating to the