A perpendicular magnetic recording/reproducing device that can suppress broadening of recording magnetic fields and that is capable of effective application of magnetic field to a recording target track is provided. The device includes a magnetic recording medium having a soft magnetic layer and a recording layer having a perpendicular magnetic anisotropy formed in this order over a substrate, and a magnetic head. The soft magnetic layer is formed with a concavo-convex pattern in which at least part of regions corresponding to tracks of the recording layer protrudes toward the recording layer, and convex portions are provided with the magnetic anisotropy in the circumferential direction of the tracks. The magnetic head includes a main pole for generating a recording magnetic field, and a return pole to which the magnetic field returns, the main pole and the return pole being arranged side by side in a track width direction.