To provide a soldering device of a tab lead for a solar cell, which does not generate cell cracks even if the solar cell is thin, and can perform soldering of the solar cell and the tab lead even on the upper surface or the lower surface of the solar cell or both the upper and lower surfaces in a stable state with excellent soldering quality.

A soldering device 100 of a tab lead for solar cell which connects a solar cell 10 and the tab lead is configured to include a preheating portion 60 and a soldering portion 70, wherein the preheating portion is equipped with a preheating means H which preheats the solar cell and the tab lead and a correcting means which corrects the tab lead, the soldering portion is equipped with a heating means which heats the solar cell and the tab lead, a tab lead pressing means 90 arranged along the tab lead arranged on the one surface side of the solar cell, a holding means which holds the tab lead arranged on the opposite surface of the solar cell and the solar cell, and a lifting means which lifts up and down the holding means.