Liquid-discharge recording head

A liquid-discharge recording head comprising:

• a liquid-supply opening through which liquid is supplied;
• and
• a plurality of nozzles through which the liquid supplied from the liquid-supply opening is discharged for recording, the nozzles being arranged on both sides of the liquid-supply opening,
• wherein the nozzles include a first nozzle group, a second nozzle group smaller in diameter than the first nozzle group, and a third nozzle group smaller in diameter than the second nozzle group, and
• wherein the nozzles of the first nozzle group are arranged only on one side of the liquid-supply opening while the nozzles of the second nozzle group and the nozzles of the third nozzle group are alternately arranged on the other side of the liquid-supply opening, a density of the alternately arranged nozzles of the second and third nozzle groups being twice a density of the nozzles of the first nozzle group.