In a printing head which makes an ink jet system printing and includes a pressure chamber supplied with an ink, a nozzle which communicates to the pressure chamber, a vibration plate which forms one wall of the pressure chamber; and pressure applying mechanism for applying pressure to the vibration plate so as to eject the ink from the nozzle, the pressure applying mechanism includes a wire for applying the pressure on the vibration plate, and a driving part for displacing the wire. At least the pressure chamber is detachably mounted with respect to the pressure applying mechanism.