A multi-layer friction lining is provided, in particular a clutch friction lining including a friction part and a reinforcement part. Thus, the electrical component socket according to the present invention is capable of urging the electrical component by a predetermined urging force even in the case of different thickness of the electrical component or different number of terminals thereof, and is applicable to a high functional device of larger heat dissipation amount. A plasma gas supplied from a plasma gas nozzle 62 disposed in the recess 74 is converted into a plasma in an area PS between plasma electrodes 76 in the recess 74, and leaves the recess 74 toward the process objects W.