PROBLEM TO BE SOLVED: To obtain a variance-free excellent junction result with higher strength with low applied pressure and small pressure area (junction area) at lower heating temperature.SOLUTION: A winding type coil is made of a copper wire having an insulating film 1a around a copper core wire 1b. A lead part 1 thereof is placed on a gold film 3a as an outermost layer of a connection terminal 3 of an IC chip 2 in a state orthogonal to two parallel sides thereof, heating and pressurizing means 5 is brought into contact with the lead part 1 from above in a state orthogonal thereto to start applying pressure, and then, while a current is supplied to generate heat, the pressure is further applied. The winding type coil has a wire diameter of 70 m±3 m (insulating film 1a: polyurethane coating), the IC chip 2 is 1000 m square, and the connection terminal 3 is in a square shape of 100 m. Further, the gold film 3a is 18 m thick, the heating and pressurizing means 5 is made of tungsten, and a contact surface 4 has long sides of 250 m in length and short sides of 70 m in width, a welding voltage is 1.8 V, a power supply time is 0.3 seconds after 0.1 seconds after the start of pressure application, the applied pressure is 80 g, and a pressure application time is 0.8 seconds.
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