An acousto-optical imaging device according to the present invention comprises: an ultrasonic source (1) which outputs ultrasonic waves an acousto-optical medium unit (2) which has an acoustic opening and into which dispersed ultrasonic waves generated by ultrasonic waves being dispersed inside an object enter inside from the acoustic opening and are propagated a wedge light source which emits a single color wedge beam that enters the acousto-optical medium unit in non-parallel with respect to the direction of propagation of the dispersed ultrasonic waves an imaging optical system (3) into which diffracted light enters that is generated by refractive index variation caused in the acousto-optical medium unit by the propagation of the dispersed ultrasonic waves and a imaging unit (4) which takes an image generated by the diffracted light formed by the imaging optical system and outputs an electrical signal. The wedge beam forms a focal point on a first cross section that is parallel to the propagation direction of the wedge beam and the direction in which the dispersed ultrasonic waves are propagated in the acousto-optical medium unit, and propagates in parallel without forming a focal point on a second cross section which is perpendicular to the cross section, wherein the focal point of the wedge beam on the first cross section is positioned between the acousto-optical medium unit (2) and the imaging optical system (3), and the light intensity of the wedge beam in the direction in which the dispersed ultrasonic waves are propagated in the acousto-optical medium unit increases monotonously according to the distance from the acoustic opening.La présente invention concerne un dispositif dimagerie acousto-optique comprenant : une source dultrasons (1) qui produit des ondes ultrasonores une unité formant milieu acousto-optique (2) qui présente une ouverture acoustique et dans laquelle des ondes ultrasonores dispersées produites par les ondes ultrasonores dispersées à lin
