A non-volatile memory device including a phase-change material, which has a low operating voltage and low power consumption, includes a lower electrode; a phase-change material layer formed on the lower electrode so as to be electrically connected to the lower electrode, wherein the phase-change material layer includes a phase-change material having a composition represented by InXSbYTeZ or, alternatively, with substitutions of silicon and/or tin for indium, arsenic and/or bismuth for antimony, and selenium for tellurium; and an upper electrode formed on the phase-change material layer so as to be electrically connected to the phase-change material layer.