To remove stains, dusts, or the like, on the surface of terminals formed to a substrate and obtain a good electrical connection between electronic components mounted on the terminals.

Dusts and dirt on the surfaces of terminals 1a of the substrate 1 are removed by a dust collector (sucking means) 3, then the surfaces of the terminals 1a are wiped and cleaned by a sheet 7 (wiping member). Because the dusts and dirt on the surfaces of the terminals 1a are removed by the dust collector 3, the wiping and cleaning is done by the wiping member as above, the dusts and dirt on the surfaces of the terminals 1a are efficiently and effectively removed, and not only good conductivity is obtained but also damages on terminal leads caused by dragging big dusts and dirt are avoided.