Patent ID: 7629534

Claim:
A contact member inserted in a piercing hole of a socket provided between a first connected member and a second connected member facing each other, the contact member comprising: a first contact part configured to come in contact with a first pad formed in the first connected member; a second contact part configured to come in contact with a second pad formed in the second connected member; and a spiral cylindrical part formed in a spiral manner with respect to an axial line connecting the first pad and the second pad, the spiral cylindrical part having one end formed in a large diameter curved part having the first contact part, the spiral cylindrical part having another end formed in a small diameter curved part having the second contact part, the spiral cylindrical part having an external circumferential surface coming in contact with an inside wall of the piercing hole; wherein a compression load in the axial line direction is applied to the first contact part and the second contact part so that the small diameter curved part situated inside the spiral cylindrical part is deformed outwardly and comes in contact with the large diameter curved part situated outside the small diameter curved part, and thereby the first pad and the second pad are electrically connected to each other with a shortest length; the spiral cylindrical part includes a third contact part provided on least one of a part of the large diameter curved part and a part of the small diameter curved part; the large diameter curved part and the small diameter curved part face each other; and the third contact part has a contact portion formed as a hemispherical surface shaped projection part.