[Problem to be Solved]There is provided an apparatus and a method that allow detection of scatterer information.[Solution]A scatterer measuring apparatus includes an irradiator that radiates phase-aligned light having a predetermined light intensity to a predetermined site of a living body from outside the living body toward an interior of the living body, a light intensity detector that detects the light intensity distribution of light emitted from the living body, and a controller that calculates a blood flow rate based on a temporal change in the light intensity distribution and calculates scatterer concentration in the living body based on the blood flow rate.
