Ink-jet head

An ink-jet head comprising:

• a passage unit having a pressure chamber communicating with an ink ejection port formed on an ink ejection face, a common ink chamber communicating with the pressure chamber, and an ink supply port formed on a surface opposite to the ink ejection face;
• a reservoir unit having an ink reservoir communicating with the ink supply port at the surface of the passage unit where the ink supply port is formed, and storing ink supplied to the common ink chamber;
• an actuator unit fixed to the passage unit and providing ink in the pressure chamber with a pressure;
• a wiring member mounting thereon a driver IC chip that supplies a drive signal to the actuator unit, and connected to the actuator unit;
• and
• two shield plates extend on the surface of the passage unit in a longitudinal direction of the passage unit, and confront each other,
• wherein the surface of the passage unit is provided with two grooves extending up to the middle of the passage unit in a thickness direction of the passage unit, and spaced to a distance equal to a distance between the two shield plates with respect to a lateral direction of the passage unit,
• wherein the shield plate is provided at its circumference with a contact line linearly extending and coming into contact with a plane formed on the surface of the passage unit,
• wherein the shield plate is provided with a projection adjacent to the contact line and protruding from the contact line,
• wherein the projection is fitted into the groove, and
• wherein the reservoir unit, the actuator unit, and the wiring member are included in a range maintained between the two shield plates, with respect to the lateral direction of the passage unit.