An acousto-optic vibrometer includes: an acoustic wave source to irradiating an object with an acoustic wave an acoustic lens system which places a scattered wave from the object into a predetermined converged state an acousto-optic medium portion in which the scattered wave transmits a sensing light source to emit a sensing light beam in which monochromatic rays of light with different traveling directions are superposed and which is incident on the acousto-optic medium portion a reference light source to emit a reference light beam in which monochromatic rays of light with different traveling directions are superposed and which is to be superposed on sensing light beam based diffracted light produced by the acousto-optic medium portion an imaging lens system which converges the diffracted light on which the reference light beam is superposed and an image receiving section which senses the light converged by the imaging lens system.
