PROBLEM TO BE SOLVED: To provide a technology capable of suppressing the influence of an error due to a movement of a subject in a subject information acquisition device for acquiring a photoacoustic signal by using light of a plurality of wavelengths.SOLUTION: A subject information acquisition device is used. The subject information acquisition device includes a light source part for irradiating pulse light of a plurality of wavelengths, a wavelength control part for switching wavelengths of the pulse light, a probe for receiving acoustic waves generated in a subject irradiated by the pulse light to propagate, a scan control part for moving the probe within a prescribed scanning range, and an information processing part for acquiring subject information by using a plurality of electric signals corresponding to the pulse light of a plurality of wavelengths, outputted from the probe at each receiving position within the scanning range. The wavelength control part switches wavelengths of the pulse light before the probe scans the entire scanning range while receiving acoustic waves corresponding to the pulse light of at least one wavelength among the plurality of wavelengths at each receiving position.SELECTED DRAWING: Figure 5【課題】複数の波長の光を用いて光音響信号を取得する被検体情報取得装置において、被検体の動きによる誤差の影響を抑制することを可能とする技術を提供する。【解決手段】複数の波長のパルス光を照射する光源部と、パルス光の波長を切り替える波長制御部と、パルス光を照射された被検体内で発生し伝播する音響波を受信する探触子と、探触子を所定の走査範囲において移動させる走査制御部と、走査範囲のうちの各受信位置において探触子から出力される、複数の波長のパルス光に対応する複数の電気信号を用いて、被検体情報を求める情報処理部を有し、波長制御部は、探触子が、複数の波長のうち少なくとも１つの波長のパルス光に対応する音響波を各受信位置で受信しながら走査範囲の全体を走査する前に、パルス光の波長を切り替える被検体情報取得装置を用いる。【選択図】図５
