. "The pressure-deformable electroconductive particle (C) is a particle prepared by coating the surface of a polymeric material such as polystyrene, epoxy resin or the like with an electroconductive metallic thin layer 9 made of a metal such as nickel, gold, silver, copper, solder or the like having a thickness of, for example, 1 micron or below as shown in FIG. 4." . . .