| 摘要 |
In a conductive contact pin brought into contact with the external electrode of a semiconductor device to conduct a test on the electrical characteristics of the semiconductor device, an upper plunger 13 which is a contact pin coming in and out of a cylindrical body is made up of a base b which is in sliding contact with the cylindrical body and is not in contact with the external electrode and an end a which comes into contact with the external electrode. The base b has at least a surface layer made of a precious metal, and the end a has at least a surface layer made of one of a different metal from the base b and a metal alloy.
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