Patent ID: 8372200

Claim:
A shower plate provided in a plasma processing apparatus to discharge gas for plasma excitation for generating plasma in a processing chamber of the plasma processing apparatus, the shower plate comprising: a plate having a plurality of longitudinal holes; a porous-gas passing body disposed in a gas inlet side of each of the plurality of longitudinal holes, which are used as a discharging path of the gas for plasma excitation; and a ceramic element, provided with a plurality of gas discharge holes, disposed in a gas outlet side of each of the plurality of longitudinal holes wherein: the porous-gas passing body having a pore that communicates with the ceramic element, in a gas flow direction, through the plurality of gas discharge holes, and an average pore diameter of a narrow path in a gas flowing path formed by the pore which passes through the porous-gas passing body is not greater than 10 μm.