Patent ID: 8915999

Claim:
A shower plate disposed in a plasma processing apparatus and releasing plasma excitation gas into the plasma processing apparatus so as to generate plasma, wherein a ceramic member and a porous gas-communicating body are formed in the inside of each of a plurality of vertical holes as release paths for plasma excitation gas, the ceramic member has a plurality of gas release holes having a diameter of 20 μm to 70 μm, the porous gas-communicating body has pores having a maximum diameter of not more than 75 μm, the pores communicating in a gas-communicating direction, each of gas-communicating paths formed by the communicating pores of the porous gas-communicating body has a narrow path having a pore diameter equal to or less than 10 μm, the ceramic member is formed in gas-introducing side of the each of the plurality of vertical holes, the porous gas-communicating body is formed in gas-discharging side of the each of the plurality of vertical holes, and the ceramic member and the porous gas-communicating body are sintered and bonded integrally with the shower plate.