Abstract: A socket for an electric part includes a pair of slide plates 7 and 8 movable in opposite directions. Contact pin-pressingportions 9 are provided on each of the slide plates 7 and 8 for opening each of contact pins 3 to opposite sides, and operating arms 18 are disposed on a socket body 2 of the socket for turning movement about base ends, and are connected to the slide plates 7 and 8 for operating the slide plates 7 and 8, respectively. Operating projections 28 are disposed on an operating member 22 for turning the operating arms 18 by the vertical movement of the operating member 22, so that the operating arms 18 are turned by the operating projections 28 by urging the operating member 22 downwards to move the slide plates 7 and 8. Thus, the slide plates can be moved easily by urging the operating member by a smaller force.