Used is an object information acquiring apparatus including an irradiation unit (103) for irradiating an object (101) with a laser beam, a wavelength switching unit (503) for selecting a wavelength of the laser beam, a restriction unit for restricting an output value of the laser beam, a probe (104) for receiving acoustic waves that are generated from the object irradiated with the laser beam, and a configuration unit for generating characteristic information relating to the object in use of the acoustic waves, wherein the restriction unit restricts the output value according to the wavelength selected by the wavelength switching unit.
