An object of the present invention is to achieve thinning of an auxiliary recording layer while maintaining the function thereof to improve SNR.A representative configuration of a perpendicular magnetic disk according to the present invention includes, on abase, a granular magnetic layer 160, and a auxiliary recording layer 180 disposed as an upper layer of the granular magnetic layer 160, wherein the granular magnetic layer 160 has a granular structure in which a grain boundary portion is formed by segregation of a non-magnetic substance containing an oxide as a main component around magnetic particles containing a CoCrPt alloy grown in a columnar shape as a main component, and the auxiliary recording layer 180 contains a CoCrPtRu alloy as a main component and has a film thickness of 1.5 nm to 4.0 nm.