A method of manufacturing an Sm-Fe-N magnet includes a sealing step (S10) of filling a metal sheath with a magnet powder including an Sm-Fe-N compound as a main component and sealing the metal sheath, a magnetic field applying step (S12) of applying a magnetic field to the magnet powder sealed in the metal sheath, and magnetizing the magnet powder by magnetically orienting the magnet powder and aligning a direction of magnetic orientation in one direction, a preliminary rolling step (S14) of preliminarily rolling the magnetically oriented magnet powder sealed in the metal sheath to make the magnetically oriented magnet powder into a green compact, and a pressurizing step (S16) of pressurizing the green compact sealed in the metal sheath and densifying the green compact to form a magnet body, wherein in the preliminary rolling step (S14), the preliminary rolling is performed by lightly rolling the magnetically oriented magnet powder sealed in the metal sheath with a pressure smaller than a pressure in the pressurizing step (S16).