to each other in this condition the pressure acting on the acf 30 is maintained constant the conventional configurations shown in fig1 3 have various problems as discussed earlier referring to fig4 an acf embodying the present invention is shown and generally designated by the reference numeral 40 as shown the acf 40 has a body 42 formed of an epoxy resin and contributing to adhesion conductive particles 44 are dispersed in the body or resin 42 and contribute to electrical connection the particles 44 are made of a ti ni cu zn cu al or similar ultraresilient alloy an ultraresilient alloy has a broader range of resiliency than the other alloys and expands or contracts in response to a change in stress the particles 44 crushed by thermo compression remains in a compressed state due to a stress acting thereon from the outside assume that the resin 42 of the acf 40 expands due to a change in temperature and or humidity pushing connection terminals not shown upward as a result the stress acting between the particles 44 and the connection terminals i s reduced this causes the particles 44 to expand due to its righting force and thereby maintains the electrical contact of the particles 44.