Soldering device, soldering method, and substrate and electronic component produced by the soldering device or the soldering method

Provided are a soldering device and method which allow for soldering at low cost with high yield and high reliability. To solve the above problems, the soldering device has: a first processing section that immerses workpiece member 10 having copper electrode 2 in organic fatty acid-containing solution, and horizontally move immersed workpiece member 10 in organic fatty acid-containing solution 31; a second processing section having ejection unit 33 to spray a jet stream of molten solder 5a to workpiece member 10 while pulling out workpiece member 10 processed in the first processing section to space section 24 that has a pressurized steam atmosphere and is provided above organic fatty acid-containing solution 31; a third processing section having ejection unit 34 to spray organic fatty acid-containing solution 31 to excess molten solder 5a on workpiece member 10 for removal while pulling down workpiece member 10 processed in the second processing section after horizontally moving in space section 24; and a fourth processing section that picks up workpiece member 10 processed in the third processing section by pulling out from organic fatty acid-containing solution 31 after horizontally moving in organic fatty acid-containing solution 31.