An inkjet head which is provided with a nozzle plate that is covered with a water repellent film including a Ni-PTFE film, and a plurality of nozzles that are formed through the nozzle plate to eject ink. In this structure, the nozzle plate is subjected to a heat treatment after the Ni-PTFE film is formed on the nozzle plate, and then is subjected to water cooling. The water cooling is performed using cooling water having a temperature ranging from 15.degree. C. through 30.degree. C. after the heat treatment is finished.

 
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> Polarizing electrode, manufacturing method thereof, and electric double-layer capacitor

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