A printed circuit board according to an embodiment of the present invention includes a base film having an insulating property, and a conductive pattern formed on at least one of surfaces of the base film, wherein at least a portion of the conductive pattern includes a core body, and a shrink layer formed by plating on an outer surface of the core body. The portion of the conductive pattern preferably has a striped configuration or a spiral configuration. The portion of the conductive pattern preferably has an average circuit gap width of 30 μm or less. The portion of the conductive pattern preferably has an average aspect ratio of 0.5 or more. The plating is preferably electroplating or electroless plating.