Provided is a thermally stable perpendicular magnetic recording medium. The provided perpendicular magnetic recording medium includes a perpendicular magnetic recording layer between a lower layer and an upper layer, wherein a thickness of the perpendicular magnetic recording is determined by Equation 7, in the case of K>105 erg/cm3 and D > ( 30 ⁢ k B ⁢ T π ⁢ K ⁢ ⁢ A ) 1 / 2 , and determined by Equation 9, in the case of K>105 erg/cm3, n > 30 ⁢ k B ⁢ T π ⁢ ⁢ D 2 ⁢ A ⁢ ⁢ K , and ⁢ ⁢ D ≤ ( 30 ⁢ k B ⁢ T π ⁢ K ⁢ ⁢ A ) 1 / 2 . The provided perpendicular magnetic recording medium includes the perpendicular magnetic recording layer having a thermally stable thickness even when the value of K is large and an energy barrier does not follow KV. Thus, data recorded on the provided perpendicular magnetic recording medium is preserved for over 10 years.