The object of the present invention is to provide an IC socket having a constitution for simplifying the motion of an activating member for operating a lever, whereby the operation of the lever may be easily applied to an automated machine. A lever member 35 having the bifurcated shape includes first and second legs 353 and 354. In the first position, the first leg 353 operably projects from the base 2 and the lid 3. On the other hand, the second leg 354 is contained in the lid 3. When the actuating member 5 is moved to rotate the lever member 35 from the first position to the second position, the first leg 353 is contained in the lid 3 and the second leg 354 operably projects from the base 2 and the lid 3.