A method for manufacturing an antenna includes steps as follows. First, a substrate is provided, wherein a surface of the substrate has an antenna region. Then, the surface of the substrate is electroless plated with a metal medium, so that the surface is covered with the metal medium. Then, the metal medium is covered with a resist. Then, a portion of the resist in the antenna region is removed. Then, the antenna region is electroplated with metal material to form an antenna main body. Then, a remaining portion of the resist is removed, and excluding a portion of the metal medium in the antenna region, the other portion of the metal medium is also removed from the substrate.