A magnetic encoder capable of securing sufficient adhesive strength of a scale molded member, preventing occurrence of cracking, breakage, etc., of the molded member, and also manufacturing at a low cost with high productivity is provided.
The present invention is directed to a magnetic encoder equipped with an annular core 20 and an annular scale molded member 42 formed on one surface of the core 20 and constituted by a plastic magnetic material multipolarly magnetized in the circumferential direction thereof. In this encoder, a plurality of radial grooves 21 extended radially and opened in a radially inward direction of the core are formed on one surface of the core 20 so that the grooves are arranged in the circumferential direction, and a filled molded portion 42 constituted by a plastic magnetic material filled in the radial groove 21 is integrally formed with the scale molded member 40.