An object information acquiring apparatus, comprising: a plurality of detecting elements which detect an acoustic wave generated from an object irradiated with light and convert the acoustic wave into detection signals； a signal determining unit which determines a detection signal detected by a detecting element which is not in acoustic contact with the object, of the plurality of detecting elements； a signal acquisition unit which generates a corrected detection signal by deleting at least a region which is not based on an acoustic wave generated from the interior of the object, from the determined detection signal； and an image processor which forms image data of the object from a detection signal detected by a detecting element which is in acoustic contact with the object and from the corrected detection signal.
