the ink that has been discharged is supplied to the pressure chamber 54 from the ink supply passage not shown this ink discharging operation is performed repeatedly and an image based on an image forming pattern is formed on the recording paper 16 as it is conveyed here when the piezoelectric element 48 is deformed in the lateral direction internal stress arises in the piezoelectric element 48 to the outer sides of the discrete electrode 50 but this internal stress is eliminated by means of the piezoelectric strain absorbing holes 52 more specifically since the piezoelectric strain absorbing holes 52 are formed in the piezoelectric element 48 which bends and deforms together with the vibration plate 44 in the region of the outer perimeter of the discrete electrode active element 50 then it is possible to eliminate cross talk to the piezoelectric element 48 at other adjacently positioned pressure chambers as shown in fig4 a to 4 e various shapes and positional configurations may be adopted for the piezoelectric strain absorbing holes 52 in an example shown in fig4 a piezoelectric strain absorbing holes 52 a are disposed along the four outer edges of each discrete electrode 50 as in the above described embodiment in an example shown in fig4 b rectangular shaped piezoelectric strain absorbing holes 52 b are disposed along the four outer edges of each discrete electrode 50 in an example shown in fig4 c piezoelectric strain absorbing holes 52 c are disposed in a.