To reduce the weight, increase the density and obtain high torque by specifying the height of a conductor and the repetition unit of the conductor and the adjacent space, providing an insulating layer in the space, and composing the insulating layer of the resin composition which has a specific molecular weight and contains monomer.

The cross-section of a coil 1 is rectangular. The height of a coil conductor 2 is approximately 50μm or more, and the repetition unit of the coil conductor 2 and the adjacent space is approximately 30μm or more. An insulating layer is provided in the space part. The insulating layer is composed of liquid photosensitive resin composition which has ethylenic unsaturated linkage with prepolymer or oligomer which has ethylenic unsaturated linkage. The molecular weight of the prepolymer or oligomer which composes the liquid photosensitive resin composition is approximately 500-50000, and the monomer composition has three or more acryloyl radicals, etc., in one molecular and contains a monomer of one kind or more which contains 1-15 atoms between the carbon atoms to which the radical is linked.