The organism observation device, as the ultra wave is irradiated to the specified territory inside the organism, irradiates the light of specified frequency to the specified territory where the ultra wave is irradiated, the frequency due to the ultrasonic vibration in the organism component which is included inside the specified territory detects the scattered light which is shifted. Speed information of the organism component is calculated from the frequency shift quantity in the detection signal of scattered light, density of the organism component is calculated from speed information, state distinction of the organism component is done making use of the value of the density which was calculated.生体観測装置は、生体内部の所定の領域に超音波を照射すると共に、超音波が照射されている所定の領域に所定の周波数の光を照射し、所定の領域内に含まれる生体構成物質における超音波振動による周波数シフトした散乱光を検出する。散乱光の検出信号における周波数シフト量から生体構成物質の速度情報を算出し、速度情報から生体構成物質の密度を算出し、算出された密度の値を用いて生体構成物質の状態判別を行う。
