Patent ID: 8888558

Claim:
A method of manufacturing a probe pin, comprising: preparing a probe pin raw material by cutting a metal wire; and forming a tapered portion by machine-working a tip end portion of the probe pin raw material while the probe pin raw material is continuously rotated around an axis thereof while forming an entirety of the tapered portion; wherein said machine-working is a grinding work in which the tip end portion of the probe pin raw material abuts against a grinding surface of a rotary-type grinding wheel whereby the tip end portion is ground thereby to form the tapered portion having a frustum-shape, and an angle constituted by a traveling direction of the grinding surface of the grinding wheel and a longitudinal direction of the metal wire is set to 45 degree or less, and wherein a rotation number of the grinding wheel is 500 to 5000 rpm, a cutting rate of the grinding surface with respect to the metal wire is within a range of 0.01 to 5 mm/sec, a mesh size of abrasive grains is 500 to 1500, and a tip end portion of the probe pin has a surface roughness Ra of 5 μm or less.