To recover printed circuit board segments from shredder dust generated by a shredder.

Shredder dust b of used domestic electric appliances is transported by conveyer means 6 of a metal separation apparatus B and metals c containing printed circuit board segments are detected from the shredder dust b by a plurality of magnetic sensors 7 installed in the direction of crossing the conveyer means 6. The metals c are blown by a gas jetted by a first jet nozzle 8 and recovered by a container 16. The recovered metals c are conveyed by conveyer means 31 of a selection apparatus C of the printed circuit board segments and printed circuit board segments with a specified color are detected by a large number of specified color identifying elements 45 arranged in the direction of crossing the conveyer means 31. The detected printed circuit board segments are blown by a gas jetted by a second jet nozzle 34 and recovered in a prescribed container 40.