The invention provides a plasma processing apparatus, in which the uniformity of the plasma density can be improved, and the electron temperature can be kept low. The golf head has a striking face and a rear side opposite to the striking face. The provision of lead frame can improve the heat dissipating efficiency and electrical performances. The spindle motor is used for rotatably supporting a disc thereon. The contact pads include a first contact pad with a first end proximate to the second longitudinal edge and a second contact pad with a second end proximate to the second longitudinal edge.