A method of manufacturing a laminar ring, which permits an improvement of efficiency of a nitriding treatment of a plurality of metallic band members which constitute the laminar ring is provided. The method includes a nitriding treatment step of subjecting first through ninth metallic band members to a nitriding treatment wherein the metallic band members are kept in an atmosphere including a nitriding gas by a predetermined concentration, for a predetermined length of time, while gaps are formed between circumferential portions of adjacent ones of the metallic band members laminated on each other such that a position of the gaps is moved relative to the metallic band members in a circumferential direction of the metallic band members, to permit nitrogen to diffuse into surface portions of the metallic band members, so that the nitriding gas can be sufficiently supplied between the adjacent ones of the metallic band members over their entire circumference, to permit the metallic band members to be sufficiently nitrided, even when the nitriding treatment is performed while the metallic band members are laminated on each other, whereby the metallic band members can be sufficiently nitrided, making it possible to increase the number of the metallic band members that can be nitrided at one time, and improve efficiency of the nitriding treatment of the metallic band members.