The photoacoustic imaging device disclosed in the present application includes an acoustic wave source 1 and an acoustic lens system 6 that converts a scattered wave 5 generated by irradiating a subject with an acoustic wave 2 emitted from the acoustic wave source 1 into a predetermined convergence state. A light source that emits a light beam on which a plurality of monochromatic light beams having different traveling directions are superimposed, and a photoacoustic medium unit 8 that is arranged so that a scattered wave that has passed through the acoustic lens system 6 is incident thereon. An image forming a light source 19 that is incident on the photoacoustic medium part at a non-perpendicular and non-parallel angle with respect to the sound axis of the lens system, and an image that condenses the diffracted light of a plurality of plane wave monochromatic lights generated in the photoacoustic medium part. The lens system 16 includes an image receiving unit 17 that detects light collected by the imaging lens system and outputs an electrical signal. The acoustic lens system 6 includes at least an image-side telecentric telecentric acoustic system 6A, an image Collection arranged on the side The distance between the telecentric acoustic system and the sound collecting acoustic system is equal to the sum of the focal length of the telecentric acoustic system and the focal length of the sound collecting acoustic system, and the luminous flux is collected in the photoacoustic medium section. Transmits at the focal point of the acoustic system.本願に開示された光音響撮像装置は、音響波源1と、音響波源1から出射した音響波2が被写体を照射することにより生じた散乱波5を所定の収束状態に変換する音響レンズ系6と、音響レンズ系6を透過した散乱波が入射するように配置された光音響媒質部8と、互いに進行方向の異なる複数の単色光が重畳された光束を出射する光源であって、光束が音響レンズ系の音軸に対して、非垂直かつ非平行な角度で光音響媒質部に入射する、光源19と、光音響媒質部で発生する複数の平面波単色光の回折光を集光する結像レンズ系16と、結像レンズ系によって集光された光を検出し、電気信号を出力する受像部17とを備え、音響レンズ系6は、少なくとも像側テレセントリックであるテレセントリック音響系6Aと、像側に配置された集音音響系6Bとを含み、テレセントリック音響系と集音音響系との距離は、テレセントリック音響系の焦点距離および集音音響系の焦点距離の和に等しく、光束は、光音響媒質部において、集音音響系の焦点の位置にお