PURPOSE: To automatically correct an imperfect part, and reduce imperfect correction without overlooking imperfection, by operating a soldering correcting part with a controller part when imperfection information is inputted from an image recognition part.

CONSTITUTION: When an image recognition part 1 recognizes imperfection on an electronic circuit board 4, information such as the kind and the position of the imperfection, the substrate land shape, and the solder quantity is sent to a controller part 2. It judges the information and gives a command to a soldering correcting part, which is made to move to the imperfect part on the board 4 by an XY robot 5. When the imperfection is a bridge, a solder intake head 12 descends, a heating part 12a heats solder, and the solder on the bridge part or the like is eliminated. After that, a soldering unit 9 descends, a board land is heated, an adequate amount of system solder 10 is supplied to a heated part through a roller 11 and a pipe 7, and soldering is performed.