the substrate 11 opposite to the end where the ejection ports 4 are located the record electrodes 2 are led out at the above end of the substrate 11 and connected to outside circuitry by wire bonding or similar means these connecting portions of the record electrodes 2 are designated by the reference numeral 5 the substrate 1 is made from a glass ceramic or silicon wafer after a metal film has been formed on the surface of the substrate 1 by sputtering or similar technology grooves 14 are formed in the above surface by dicing the grooves 14 are arranged at a pitch implementing a desired resolution and serve as the ink passageways 9 the ridge between nearby grooves 14 forms a wall 10 separating the grooves 14 thus the metal film formed on the tops of the walls 10 which has been divided by dicing is allocated to the individual ejection ports 4 the divided portions of this metal film constitute the record electrodes 2 the ink passageways 9 are each communicated to the respective ejection port 4 the walls 10 each define a point ejection point 3 for ejecting toner at the associated ejection port 4 the ink in each ink passageway 9 forms a meniscus between the ejection points 3 of the walls 10 delimiting the passageway 9 in the illustrative embodiment the grooves 14 are not simply straight specifically the grooves 14 are deep and broad at the ejection ports 4 but shallow and narrow at the connecting portions 5 for the following reasons 1 4 1 the record electrodes 2 formed on the tops of the walls 10 must have their connecting portions 5 bonded or otherwise connected to outside circuitry therefore the connecting portions 5.