Provided is a technique for achieving a narrower pitch without causing any problem in terms of contact force and strength at each contact point. A socket includes a frame body including an outer peripheral frame and a plurality of elongated slit frames arranged in parallel with each other on the inside of the outer peripheral frame; a plurality of contact blocks inserted between the adjacent slit frames and held on the frame body; and a reinforcement frame formed separately from the frame body and mounted on the frame body so as to intersect the slit frames.
