Patent ID: 7815438

Claim:
A needle-like member that constitutes a conductive contact which electrically connects a first object to a second object, the needle-like member comprising: a columnar member having a first end and a second end; a through hole extending entirely through the columnar member from the first end to the second end to form openings in said first end and in said second end; a contact member integrally formed on the first end of the columnar member and configured to electrically contact with the first object; and a spring member that surrounds an outer surface of the columnar member and applies an elastic force on an other needle-like member present in the through hole, wherein the through hole has hole portions with different inner diameters, and wherein one hole portion has such an inner diameter and a length that an electrical contact resistance can be maintained constant between the one hole portion and the other needle-like member, and inner diameters of other hole portions are larger than the inner diameter of the one hole portion.