A phantom used for evaluating an object information acquiring apparatus comprises a first layer irradiated with at least one of light having a first central wavelength based on the optical coherence tomography and light having a second central wavelength based on the photoacoustic tomography, and which has a first scattering region having a first light scattering coefficient, and a second scattering region forming a first pattern with the first scattering region and having a second light scattering coefficient; and a second layer which is integrated with the first layer, and has a first absorption region having a first light absorption coefficient, and a second absorption region forming a second pattern with the first absorption region and having a second light absorption coefficient.
PHANTOM