This living body monitoring apparatus includes image acquisition means emitting light to a living body and acquiring a living body image by imaging the living body to which the light is being emitted, concentration acquisition means acquiring a concentration of a blood component of the living body by analyzing the living body image obtained by the image acquisition means, information acquisition means acquiring information about a change of a circulating blood volume contained in the living body on the basis of the concentration of the blood component obtained by the concentration acquisition means, and output means outputting the information about a change of a circulating blood volume obtained by the information acquisition means.
