The present invention employs an object information acquiring apparatus that includes a light source, a holding unit configured to hold an object, an acoustic receiving unit configured to receive an acoustic wave generated by irradiating light, which is emitted from the light source, on the object via the holding unit and convert the acoustic wave into an electric signal, a light measuring unit configured to measure the light emitted from the light source, a processing unit configured to calculate a light density distribution in the object based on the light measured by the light measuring unit, and generate property information of the inside of the object on the basis of the light density distribution and the electric signal, and a supporting unit configured to support the holding unit and at least a part of the light measuring unit to be removable independently from each other.
