PURPOSE: To uniformly load each pin and readily change a load to each the pin.

CONSTITUTION: After a board 5 is placed on a tray 6 and a pin 2 is inserted into an array jig 1, the array jig 1 is superimposed on the tray 6 so that the center of the pin 2 may be placed at the center of a pad 4 on the board 5 to assemble a pin-erecting box 8. The pin-erecting box 8 is heated within a heater and also rotated, and a centrifugal force caused by the rotation acts in the pressing direction. After preliminary solder 3 melted on the pin 2 is melted to connect the pin 2 to the pad 4, the pin-erecting box 8 is cooled and the array jig 1 is removed from the tray 6, so that the pin-erecting onto the board 5 can be completed.