PROBLEM TO BE SOLVED: To provide a technology for suppressing irradiation of unnecessary irradiation light accompanying the switching of wavelengths in a subject information acquisition device that performs photoacoustic measurement with a plurality of wavelengths.SOLUTION: A subject information acquisition device that emits light to a subject, receives an acoustic wave generated in the subject by an acoustic wave probe, and based on the acoustic wave, acquires information inside the subject includes: a light source for selectively emitting irradiation light of at least two kinds of wavelengths emitted to the subject wavelength switching means for instructing switching of the wavelengths of the irradiation light to the light source an illumination optical system that is connected to the light source and guides the irradiation light to the subject and light irradiation limiting means for limiting the irradiation of the irradiation light to the subject from when the wavelength switching means instructs switching of the wavelengths of the irradiation light to the light source until the light source completes switching of the wavelengths of the irradiation light.COPYRIGHT: (C)2014,JPO&INPIT【課題】複数の波長で光音響測定を行う被検体情報取得装置において、波長の切り替えに伴う不要な照射光の照射を抑制する技術を提供する。【解決手段】被検体に光を照射し、前記被検体内で発生する音響波を音響波探触子で受信し、当該音響波に基づいて、前記被検体内部の情報を取得する被検体情報取得装置であって、前記被検体に照射される、少なくとも二種類の波長の照射光を選択的に出射する光源と、前記光源に対して、前記照射光の波長の切り替えを指示する波長切替え手段と、前記光源と接続され、前記照射光を被検体に導く照明光学系と、前記波長切替え手段が、前記光源に対して照射光の波長切り替え指示を行ってから、前記光源が照射光の波長切り替えを完了するまでの間、前記被検体に対する前記照射光の照射を制限する光照射制限手段と、を有することを特徴とする。【選択図】図1
