NOVELTY - An electroconductive adhesive tape (23) has adhesive layer (22) in one surface of metal foil (21). Adhesive tape has maximum resistivity of 1 ohm or less in first cycle. Maximum resistivity of adhesive tape in 200th cycle is higher than the maximum resistivity of adhesive tape in first cycle by 5 times or less, measured by heat cycle test. Heat cycle test is performed by sticking adhesive tape to silver plating, allowing constant current through adhesive tape and silver plating, heating, subjecting to thermostat set, cooling, and measuring resistance of sticking portion.    USE - Electroconductive adhesive tape. Uses include but are not limited to liquid crystal display device, organic electroluminescent display device, plasma display panel, electronic paper, solar cell, earthing of printed circuit board, exterior casing of electronic device, static electricity elimination and power supply device.    ADVANTAGE - The electroconductive adhesive tape has excellent durability.    DETAILED DESCRIPTION - An electroconductive adhesive tape has an adhesive layer in one surface of a metal foil. The adhesive tape has maximum resistivity of 1 ohm or less in first cycle. The maximum resistivity of the adhesive tape in 200th cycle is higher than the maximum resistivity of adhesive tape in first cycle by 5 times or less, measured by heat cycle test. The heat cycle test is performed by sticking the adhesive tape to silver plating, such that sticking portion has size of 5 mmx 6 mm and area of 30 mm2, allowing constant current (2 A) through the adhesive tape and silver plating containing sticking portion, maintaining at -40 degrees C for 10 minutes after reducing the temperature from 25 degrees C to -40 degrees C, heating at 85 degrees C, maintaining for 10 hours, subjecting to thermostat set, cooling, and continuously measuring the resistance value of the sticking portion.    DESCRIPTION OF DRAWING(S) - The drawing shows schematic view of electroconductive adhesive tape.    Metal foil (21)    Adhesive layer (22)    Electroconductive adhesive tape (23)    Terminal portion (24)    Through-hole (25)    Electrical connection portion (26)