An ultrafine shielded cable includes a twisted wire formed by twisting a coated wire and an external conductor together, the external conductor composed of metal wires being placed side by side vertically along a longitudinal direction of the coated wire having an insulation layer therein formed on a periphery of an inner conductor, a shield layer provided on a periphery of the twisted wire for collectively covering the coated wire and the external conductor, and a jacket provided on a periphery of the shield layer to cover thereof. The shield layer is helically wound so that a conductive wire strip formed by a rolling process is in contact with the external conductor.