Electrical connecting device and method for making same

An electrical connecting device comprising:

• a first circuit board providing thereon with input/output terminals, each of said terminals having a tip surface coated with a first metal layer;
• a second circuit board providing thereon with contact terminals, each of said terminals having a tip surface coated with a second metal layer;
• a low-melting point alloy layer being formed by a mutual action of metals in the respective first and second metal layers, when said input/output terminals of the first circuit board are in contact with the respective terminals of the second circuit board and electrically connected to each other through said low-melting point alloy;
• and
• at least one of said first and second metal layers comprising a plurality of wire-like metal supports extending substantially perpendicular to said tip surface of the terminal and a low-melting point metal retained by said wire-like metal supports.