1. A fuzzy logic semifinished integrated circuit comprising: a base plate, a multiplicity of identical basic circuit elements fabricated on the base plate for constructing desired fuzzy logic circuits operable in a current mode in selected combinations of the basic circuitelements, each of the basic circuit elements comprising a non-wired current mirror which is connectable to construct a bounded-difference circuit with use of connection patterns, each of said fuzzy logic circuits comprising at least one said bonded-difference circuit, and an insulating film formed over the entire surface of the base plate for insulating said basic circuit elements from said connection patterns except for conducting positions of said basic circuit elements.