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We study the nuclear ground-state properties by using the unitary-model-operator approach (UMOA). Recently, the particle-basis formalism has been introduced in the UMOA, enabling us to employ the charge-dependent nucleon–nucleon interaction. We evaluate the ground-state energies and charge radii of 4He, 16O, 40Ca, and 56Ni with the charge-dependent Bonn potential. The ground-state energy is dominated by the contributions from the one- and two-body cluster terms, while, for the radius, the one-particle–one-hole excitations are more important than the two-particle–two-hole excitations. The calculated results reproduce the trend of experimental data of the saturation property for finite nuclei.