Patent ID: 6984135

Claim:
A press fit pin ( 1 ) comprising a press-fitted region ( 6 ) to be press-fitted and connected to a conductive through hole ( 20 ) of a circuit substrate (B), the press fit pin characterized in that: the press-fitted region is formed into substantially an M-shape in cross-section, the substantially M-shape comprising two beam-like regions ( 8 ) extending substantially in parallel, and a connection region ( 9 ) connecting the beam-like regions in a deformable manner, the connecting region not extending downward beyond a distal end of the beam-like regions, wherein the connection region is formed into such an arcuate shape in cross-section that the upper surface of the arcuate shape corresponds to a valley side of the M-shape, is a concave surface ( 9 a ) and has only a single arcuate shape extending between the two beam-like regions, and an opposite lower surface of the arcuate shape is a convex surface ( 9 b ), wherein the lower surface includes left and right inner side continuous portions ( 12 ) where the lower surface of the connection region and inner surfaces of the two beam-like regions ( 8 b ) are continuous to each other; and wherein a part of the upper surface ( 9 a ) is located below a straight line (L) connecting the left and right inner side continuous portions.