Patent ID: 8591267

Claim:
A contact head comprising: a head base; and at least two elastic contact pieces located on an upper end portion of the head base and configured to electrically contact a contact target object, wherein a dent having a circular horizontal cross-sectional shape is formed at a central portion surrounded by the at least two elastic contact pieces, each of the elastic contact pieces has a tip end serving as a free end thereof and a base end portion continuous to the head base, and each of the elastic contact pieces is formed to be elastically deformable in a vertical direction by being formed to extend spirally with the tip end located on a circumference of at least one virtual circle which is a circle concentric with an inscribed circle inscribed in a horizontal cross-sectional shape of the head base and which has a diameter being smaller than a diameter of the inscribed circle, and being formed into a shape so as to spread out wide from the tip end toward the base end portion.