PURPOSE: To easily realize a reduction in operating force and conform to the increase in pin number and reduction in pitch of an electric part.

CONSTITUTION: A rotating shaft 26 is rotatably supported by semicircular bearing recessed parts formed on base wall surfaces 10a on both sides of each contact line. A L-shaped lever 28 is rotatable around the rotating shaft 26. The lever pressing surface 12a of a cover 12 is opposed to a shaft 30 fixed to the long arm part of the lever 28, and the base end part of a link 34 is rotatably mounted on a shaft 32 fixed to the short arm part 28b of the lever 28. The top end part of the link 34 has a push-up bar 38 covered with an insulating body 36 in parallel to the contact line. The push-up bar 38 is opposed to a curved or bent part 22g between the straight spring part 22c and lead pressing part 22d of a contact 22.