This joint is a joint by which a first member and a second member are joined via a joining part, the joint characterized in that the joining part contains an intermetallic compound of a first metal, and a second metal having a higher melting point than the first metal; the first metal is Sn or an Sn alloy; the second metal is a Cu alloy; a heat conducting part containing the second metal exists between the first member and the second member; and the first member is in contact with the joining part and the heat conducting part.