A lid for securing to the rim of a container, the lid including inverted dimples positioned along a top wall of the lid for engaging the rim of the container. Then, using of the mask, the peelable film and the first film to be patterned are etched selectively to form a first patterned thin film. Thus, damage and deterioration in assembly efficiency as a result of axial run-out of the rotating shaft can be inhibited, such as deterioration in assembly efficiency caused by adhesion between a magnet and coils wound on an armature core, for example. The elastic member 4 may be a lengthy flat spring.