Socket for testing electrical parts

A socket for an electrical part, comprising:

• a socket body;
• and
• a contact pin having a contact portion for contacting a terminal of the electrical part, the contact pin being disposed in the socket body by being inserted into a through hole of the socket body,
• wherein
• the contact pin comprises a fixed portion by which the contact pin is fixed to the socket body, and a plate-like elastic piece extending upward from the fixed portion;
• the fixed portion is fixed when the fixed portion is inserted into the through hole of the socket body;
• the elastic piece of the contact pin is formed to be elastically deformable in a plate-width direction of the elastic piece such that the contact portion of the contact pin is contacted to and separated from the terminal;
• the contact pin being provided with a biting portion located between the fixed portion and the contact portion and protruding along a plate surface in the plate-width direction, and designed to bite an inner wall of the through hole of the socket body;
• the biting portion forms a bitten portion on the inner wall by biting the inner wall;
• when the biting portion bites the bitten portion on the inner wall, the vertical movement of the contact pin is restricted and at the same time, the biting portion is pressed by the inner wall so that a preload is given to the elastic piece in a direction of closing the contact portion of the elastic piece,
• a movable member movable with respect to the socket body is disposed on an upper side of the socket body;
• an operation portion, which is inserted into a through hole of the movable member and pressed at the time the movable member is moved, is provided on the elastic piece of the contact pin;
• and
• the operation portion and the biting portion are protruded in a direction opposite to each other.