Abstract: Disclosed is a manufacturing method which enables manufacturing of an ultra-fine, thin contact for current inspection jigs. After a gold or gold alloy plating layer is formed, an Ni electroformed layer is formed by electroformation on the outer periphery of the formed plating layer. After a resistant layer is formed on the outer periphery of the Ni electroformed layer, a spiral groove is formed in the resistant layer by laser exposure, and etching is carried out using the resistant layer as a masking material. The Ni electroformed layer is removed from the part of the resistant layer where the spiral groove was formed, and then the resistant layer is removed and the plating layer is removed from the part of the spiral groove section where the Ni electroformed layer was removed. The core material is then removed, leaving the plating layer inside the periphery of the Ni electroformed layer.

Abstract: The invention provides a method of producing an electrocast tube having a fine inner diameter, and an electrocast tube. It also provides a thin wire material for production of an electrocast tube having a fine inner diameter. An electrocast tube producing method comprising the steps of forming an elecrtodeposit around a thin wire material (30) by electrocasting, and removing the thin wire material (30) from the electrodeposit, wherein the thin wire material (30) is removed either by heating the electrodeposit for thermal expansion or by cooling the thin wire material (30) for contraction, so as to form a clearance between the electrodeposit and the thin wire material (30), followed by gripping and pulling, or sucking the thin wire material (30) or physically pushing it away or blowing gas or liquid to push it away.