SOLDERING METHOD AND SOLDERING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a soldering method and soldering device for preventing soldering defect and soldering a flexible circuit board and an electric part stably and property. SOLUTION: Soldering is carried out by using far-infrared radiation as heat ray, forming an irradiation hole 21 large enough to irradiate an entire of an electric part 3 including at least a soldering part 4 by heat ray irradiation and irradiating an entire of the electric part 3 including the soldering part 4 with far-infrared radiation.