Electrical connecting apparatus

An electrical connecting apparatus comprising:

• a ceramic base plate provided with a plurality of first conductive portions on one face, a plurality of second conductive portions electrically connected with said first conductive portions on the other face, and further, a plurality of pins electrically connected with said second conductive portions and projecting from said other face;
• an electrically insulating resin base plate disposed on the one face of said ceramic base plate and having a plurality of third conductive portions brought into contact with said conductive portions on a side face of said ceramic base plate, and having a plurality of fourth conductive portions electrically connected with said third conductive portions on a face opposite to the side of said ceramic base plate;
• a plurality of contacts attached to said fourth conductive portions so as to be brought into contact with an electrode of a device under test;
• a plate-like socket device disposed on said other face of said ceramic base plate, said socket device having a plurality of recesses opening toward the face of said ceramic base plate so as to receive said pins individually and having a plurality of pairs of holding members disposed individually in said recesses for releaseably holding said pins received in the corresponding recesses;
• and
• a wiring base plate disposed on the other face of said socket device and having a plurality of fifth conductive portions electrically connected to one of each pair of said holding members.