A socket includes a housing and a plurality of contacts. The housing has a bottom plate with a first face and a second face that are parallel to each other. Contact supporting holes penetrate the first face and the second face. The housing has a frame body disposed upright on an edge of the first face and extending along the edge. The contacts are disposed in the contact supporting holes and supported by the bottom plate in a state in which the contacts protrude from both the first face and the second face. The contacts include a first contact having a first base inserted into one of the contact supporting holes, a first contact portion having a pair of first protrusions protruding from one edge of the first base, and a second contact portion having a pair of second protrusions protruding from another edge of the first base.