Head chip, liquid jet head and liquid jet recording device

A head chip adapted to jet a liquid comprising:

• a first plate having a plurality of pressure chambers adapted to apply pressure to the liquid;
• a second plate having a plurality of nozzle holes adapted to jet the liquid in response to application of the pressure;
• and
• a third plate disposed between the first and second plates, and provided with a plurality of through holes individually communicated with the plurality of pressure chambers and the plurality of nozzle holes, respectively,
• wherein in the through hole, a second opening region opposed to the second plate is larger than a first opening region opposed to the first plate,
• in the first plate, a plurality of ejection channels as the plurality of pressure chambers filled with the liquid, and a plurality of dummy channels which are channels not filled with the liquid, are alternately arranged side by side, and
• the second opening region in the through hole extends from an opposed region to the ejection channel to an opposed region to the dummy channel adjacent to the ejection channel.