We have studied the electrical properties of the graphitic electrodes formed in boron-doped homoepitaxial diamond films in order to make reliable ohmic contacts in diamond-based electronic devices. Boron-doped homoepitaxial diamond films were synthesized by gas-phase doping of boron during the chemical vapor deposition growth. The graphitization of diamond by Ar ion implantation was utilized for the graphitic electrodes. The electrical properties of graphite/diamond contacts were investigated by using the current-voltage measurement. The specific contact resistance was characterized by applying circular transmission line model (CTLM) extrapolation method and determined to be 1.18 Omega.cm(2).