A dielectric recording medium unit is provided with: the dielectric recording / reproducing head; a tracking mechanism of the dielectric recording / reproducing head; the dielectric recording medium placed facing to a probe of dielectric recording / reproducing head; and a X-Y stage for parallel-translating the dielectric recording medium. These components are stored in a package. The package is provided with: an electrical connection device for allowing the electrical connection with an external apparatus; and mechanical connection devices for allowing the mechanical connection with the external apparatus. The dielectric recording / reproducing head is provided with: the probe; a return electrode for returning the electric field applied from the probe; an inductor placed between the probe and the return electrode; and an oscillator.