A thin film magnetic device is provided, in which magnetic permeability in a high frequency range can be easily improved. Scratch-like grooves extending along an extending direction of a coil (for example, a Y-axis direction being an extending direction of a second coil part) are formed at least one side of a surface and a back of each of a lower magnetic film and an upper magnetic film. A magnetization direction of anisotropic magnetization is controlled in each of formation areas of the scratch-like grooves (formation areas of lower magnetic films and upper magnetic films), and therefore displacement (rotation) of the magnetization direction of the anisotropic magnetization is pinned by the scratch-like grooves. Consequently, certain magnetic permeability is kept even in a high frequency range. Moreover, such formation of the scratch-like grooves may not cause complexity in manufacturing process.