PURPOSE: To prevent flux, solder, and other foreign matter from sticking to a contact point part or the like in a surface mount circuit board, and make cleaning after soldering unnecessary or simplify it.

CONSTITUTION: When flux 40 is supplied together with solder to a soldering part of a surface mount element 30, solder is melted by using a heat source, and soldering is performed, a circuit board 10 with function for preventing flux residue sticking prevents foreign matter like residue of solder and flux from sticking to a specific part 20. In order to prevent that foreign matter 50 like the residue of solder and flux scatters, flows and sticks to the specific part 20, a preventing wall 60 for foreign matter sticking is formed around the specific part 20 on the circuit board. The wall has a specified height and a specified thickness.