Provided is an object information acquiring apparatus, comprising: a laser light source configured to irradiate laser light onto an object； a detector configured to detect a part of the laser light from the laser light source； a receiver configured to receive an acoustic wave that propagate from the object, based on the irradiation of the laser light； and an acquisition unit configured to acquire information relating to the object, based on a reception result of the receiver and a detection result of the detector, wherein the detector detects anomalous emission from the laser light source.
