C-shaped compliant contact

A C-shaped compliant contact composed of a connection portion to be connected to an electric cable or a connector on the rear side of a printed circuit board, a press-fitting portion to be fixed in a cylindrical through-hole of the printed circuit board by press-fitting, and a contact portion to be in contact with a contact of a mating connector, said press-fitting portion formed to have an inner periphery forming a U-shaped groove in cross-section having flexible sidewalls with an outer periphery having at least one arc portion in cross-section, circles inscribing said inner periphery of said U-shaped groove and circumscribing said sidewall arc portion of said outer periphery being in an eccentric relation, and the thickness of said arc portion in cross-section progressively decreasing on proceeding toward the open end of the U-shaped groove to make said arc portion contacting said through-hole of said printed circuit board longer, wherein said U-shaped groove is formed with a ramp surface located inside said inner periphery adjacent to said connection portion and merging with the bottom of said U-shaped groove and inclined to make said U-shaped groove shallower, and a protrusion projecting from the center of the bottom of said U-shaped groove toward the outside thereof is provided along substantially the full length of said U-shaped groove, the protrusion being configured such that it serves to prevent the separation of the distal ends of the sidewalls of the U-shaped groove from the inner surface of said through-hole without adversely affecting the flexibility of said distal ends.