An object information acquiring apparatus according to the present invention has: a light source emitting light a holding member holding an object a probe receiving an acoustic wave, generated by the object when the light is irradiated on the object via the holding member, and outputting a received signal and a signal processor acquiring information extracted from the object by using the received signal, wherein a region of the holding member that comes into contact with the object is configured as a non-uniform region that is a region where a normal direction of a tangential plane between the holding member and the object is not constant.
